@Herofeeder - I think what needs to be realized is that such a means of promotion is why you aren't ending up with the comments that you would like to receive. Chances are, a lot of those people you subbed to just to get them to check out your comic, have only reciprocated because they wanted to keep you as a sub too. However, what many of them don't know is if you're actually checking out their work or not, because the one comment you copy and paste gives nothing to go off of. And it goes vice versa too. For many of them, you would have no idea if they read yours or not. In turn, you could be gaining a bunch of inactive subs, and when people aren't reading, it reduces your chances of getting onto Trending, which could in turn, net you more readers. Watching that sub number increase bit by bit is useless if those people aren't actually interested.
I know that getting noticed early is insanely hard to do. I started in May, and my first month felt like hell to me. You're already at 45 subs, and at around the same time, I was at 30. What I had to realize, was the more content I created in time was going to eventually net me more views. Having such a small sample of material isn't going to draw a ton of people in from the get go, unless you're a person with godly art skills that makes it onto the Staff Picks right away. You need to have patience, and focus on creating the best content you have, and fans that will show actual interest will come in time. Slowly, you'll see people trickle in that leave genuine comments.
My best advice for you is to go into those comics you subscribed to, and actually read the ones you're interested in. Unsubscribe to all of those ones you're not reading. From there, read at your own pace, and chime in with a genuine comment every now and then for pages that actually interest you. I think that once people see how genuine you really are, and they can get a feel for your personality, they will be interested in checking out your work as well. To promote, use twitter or Facebook as much as you can, participate in the forums, network like I mentioned with commenting and just stay consistent with your updates, and strive to improve. Building a large readership can take years for people. You really need to develop patience in this field, because webcomics are a niche market to begin with, and you're one in thousands of people vying for a very small piece of the readership pie. Forming genuine relationships with your readers and other artists is what's going to get you through these tough times, and not just having a bigger number next to your sub count just for the sake of having one.
Sorry for the wall of text, but first impressions are everything. I recommend trying for a fresh start (not in terms of redo-ing your comic, just establishing relationships with people) and seeing how it goes.