Here doesn't say anything about getting rich, getting money can be any quantity, even just what has been invested. But there is true, one should... have close to the ground expectations or none at all with their passion projects.
Then, know that the artist actually doesn't get $12, but way less due to taxes and other fees or transactions just as much as you have to pay more. Personally, I wouldn't use Fiverr at all, neither as a client nor an artist, due to the many fees, and overall system of the platform.
The art does look bad to me, again, me, personal value as an artist myself. To me it doesn't look very different to what I would expect from a minor in a Latam group posting The revolutionary manga that'll save Latinoamerica in Jump Plus. I know, very specific, but its what I've seen most of the time.
Like... this is the first episode. Anatomy is wrong, coloring is very amateurish and saturated, there are white lines, choppy edges, very small resolution and pixelated, almost as if drawn in a canvas smaller than 800pixels
Latest chapter ain't that far away, just increased a bit the resolution of the canvas. Text looks like if it was added with Microsoft Pain XP

I personally wouldn't read anything with said quality, since the first thing that attracts a comic reader will likely be the art, unless I was a minor who still hasn't developed an artistic eye nor has consumed a considerable amount of comics to know what is good arstyle and what is something that still needs polishing..
Then you are releasing every now and then instead of keeping a steady schedule and flow of interest, if I had to wait several months for a comic, I would likely have to re-read it to reconnect with the story, if the art is not that good then it'll be a task that'll likely make me drop it.
That's something you'll have to search on your own, based on your own preferences and the fact that the artist is interested in doing the genre of your story, as many artists delete their posts once they get a long term commission for comics in order to not receive further offers, you can always make an anonymous post in a group Looking for Artists then see their offers and samples. As well, I wouldn't recommend anyone that I don't know nor know how they work.
But I can make an exception, just that is your responsability to talk to the people or understand if they have limited english, or whatever. Some may be a bit higher than $12, but hey, you can tell the difference even from a screenshot and miniature.
This was just me scrolling for a bit on Facebook





The fact you don't see an issue doesn't mean others won't... some people may have higher standards... or well, I get spending money on something then realizing there were better options takes time, but like, look at the art of these people then the one of your comic and start comparing, quality, lines, anatomy, shading, etc.