It's been three years. I doubt it good for you though.
My suggestion would be to consider easing yourself into the comic writer space rather than trying to jump in with a 15+ Chapter behemoth.
I'm not sure what the $22,500 price tag was quoted off of, but I agree- that would be too much for most anyone to just blow out of pocket willy nilly. But, riffing off of this:
You could consider starting with some smaller project(s) at a size/cost that you can afford and see if you can form some working relationships with an artist or two. Granted even someone you work well with won't necessarily agree to do a huge comic for free or anything, but you never know! Maybe the right person will take a great interest in another one of your stories after working with you on a project or two, y'know?
In short it's like... consider learning to swim in the shallow end of the pool instead of the deep end where you might just drown before you even get started :0
I don't really know about giving up or not, but learning to draw would be useful even if you keep looking for an artist. You could get started on your comic (learn a lot in the process) and you'll have more to show a potential partner/a better understanding of what you need/want from them art-wise. Win-win.
Saying "they don't" is kinda like saying "never" - perhaps that's true but perhaps it's not.
Certainly, partnerships haven't worked before for you. Finding one who will love your ideas, & will work on them, as much as you do isn't easy.
Also, I think that certainly 22 Grand seems an insane amount of cash to throw at something that isn't a necessity or a money-making project.
If those two doors are closed for you, you do have two options left - chuck the whole project or learn to draw. I assume you want to keep working on it, so find out how much a few classes on drawing will cost you. Find classes that are directed at the kind of art you need, not just whatever the schools want to force on you. You'll be investing in your project and investing in a general skill that may turn out even more useful to you.
I've done many smaller projects the artist just always disappears. I've been at this for about three years.
Maybe art takes decades to get good at so I'm unsure if I want to commit to it. I'm kind of to old to really start it.
Yeah, it can be a long road. Especially if you need some fine, detailed art instead of simpler cartooning sort of drawings.
Maybe your story could be told as a novel with some illustrations?
You don't have to be WLOP to make art that works for a comic 
. If you can stick with a schedule to post something (doesn't have to be "good") and watch tutorials/do studies from your favorite comics, it won't take decades to be competent.
Also yikes, I'm twice your age and got back to drawing seriously last year. Hope 34 isn't too old ;_;
depends on how fast you get good. For me it will be very slow, I've been drawing since I was 14. I haven't improved much despite all the tutorials and studies I've done
Sneaking a peek at another reply giving your age, I would also say that you'll likely find better luck with more stable partnerships as you get older tbh 
It's great that you have enough drive to start trying to get experience even as early as 14, but especially if you were working with people around your same age, it's not terribly uncommon for people to lack a similar drive or work ethic to commit to something like a collaborative comic.
Regarding "am I too old to get started if I want to draw?", heck no LOL. Big agree with @migxmeg - not only do people get started well after their teens, but you're still super young in the grand scheme of things. You have your whole life to continue trying out new things and developing new skills 
Drawing's not for everyone and if you find yourself not enjoying it then you of course don't have to force yourself too, but the way you were talking earlier I thought maybe you were like... going into retirement or something 
definitely don't give up on either trying to find collaborations or learning to draw if you want to~
I still refer back to my previous reply for how to get started (i.e. still maybe try not to do a 15+ chapter comic for your first collab with an artist you've never worked with) but otherwise no reason to be down or give up.
You sound like you're in a rush to get this project done. While I can sympathize with that, I was 17 not too long ago, I think you should be more unconcerned about how long it's taking you to "get good." I do want to get into your drawing skills and help you there, if you don't mind, though I understand if you wouldn't want to.
But as for you initial question, and since hearing about how you've been burned by artists in the past, it might be a good idea to step away from petitioning from collabs and regroup. Reconsider what your goals are and how to put your time and effort into the right places, such as leveling up your drawing skills and saving money if you choose to collaborate in the future.
You're still very young, so you really don't need to worry about any of this. You're making way more progress than you think.
Maybe you should give up on collaborations though, for a couple years. Focus on writing scripts, improving your craft. Branch out to short stories and poetry, lots of smaller projects for yourself. Do the same thing with drawing. Small projects made for practice and fun. You'll get better and better all on your own until suddenly one day you look at yourself and realize, "Holy crap I've improved so much."
If comics really are your passion, then practicing both writing (in all mediums, but especially scripts), and art (in many styles and different software) should be paramount here. Have fun with them both! But don't try to rush through trying to make the giant pro projects when it's too expensive and too expansive; it's just a road to frustration. Trust me on that one; a skilled enough internet stalker could very easily dig up 5 or 10 failed collab projects I had when I was 17 that were way too ambitious and took up way too much of my time. I really had much more fun working on smaller stuff later on.
My drawing skills are just bad. I watch tutorials and read books but they just never improved. I've been drawing for almost 4 years.
I work on smaller things I just can't do them because I can't draw and the person who was supposed to do that disappeared.
Christ, 17. You're only a baby yet.
The great thing about comics is the low entry barrier. Even if your works a little rough your storytelling can still shine through. I say chance your hole and start drawing. Comics have a great way of putting you through your paces in a way that practice drawings and tutorials won't because the story will demand certain things from you.
Also, if you've made your fair share of work on your own steam it may be easier to net an artist for other work. I don't know about everyone else but I'm far more keen to work with someone who's actually wrangler with the medium themselves.
You have so much time to learn new skills. So much time. My drawings were still absolutely terrible three years after I started trying to learn as well, it takes a long, long time. By saying you'll never improve, you're only creating a self-fulfilling prophesy. I have a friend in his mid 30's who only started learning how to draw a few years ago, also in order to create a comic, and his figures and perspective are only just now starting to come along nicely. He's still only working with pencil, and has a while yet to go before he can actually transition to digital and begin his comic in earnest, but he's on the right path. Again. Mid 30's.
I don't know what this society has done to convince 17 year olds they're too old to learn new skills, but wow. No dude. You're so young.
Art takes many years to learn. Art takes a long time to create, which is why you're having trouble finding an artist to work for free.
The only way to improve with art is to just do it, draw heaps and heaps, and accept that for the first few years, your drawings will probably be terrible. Enjoy making them anyway, and appreciate the improvements as they come.
If it's not just that you're not good at drawing yet, and it's more that you hate drawing, then there are other ways to get a script into the world. (You stated above you hate novels.) You can structure it like a play and upload it to the novel section. You could look for voice actors to turn it into a radio play on YouTube. Or, you could just hold onto it, refine it over the years, and see if a comic publisher will buy the rights from you. (In which case, they pay for the artist.)
But seriously, the best way to get a comic created is to learn how to draw it yourself. Accept that will take many years, and enjoy the journey.