When I first joined Tapas I didn't know about these forums so I relied on looking at the categories to find new stuff to read. Unfortunately when you do that you're presented with all of the really successful works but few of the smaller, lesser known stuff. Don't get me wrong, I love Heartstopper, R.U. Screwed, and the likes, but I also like checking out things that are different.
The forums, after I discovered them, gave me the opportunity to do so. It seems like it's mostly people just starting out posting here. It's nice to see such a wide variety of stories, art styles, skill levels, et cetera. I love watching people's stories grow, their skills develop, and them finding their confidence.
If I sub to somebody's work it's because it piqued my interest. I may not read it right away, but that's only because it joins a queue. People will know when I start reading their stuff because I tend to binge read, so suddenly you'll get notifications that I've liked or commented on 10 or so of your pages. Often these binges will be kickstarted by an update showing up in my notifications. If I see you've just uploaded episode 97 I will not read it because I don't want spoilers - instead I'll go back and pick up where I left off last time, so even though you've just uploaded episode 97 you'll see me liking episodes 13-18 or whatever. Once I've caught up, then I start liking and commenting on the new stuff.
That being said, if somebody subs to my work I will sub to theirs as a courtesy. The difference between me and those "sub4sub" people is that I will actually READ the work that I've subbed to. Once again, it might not be today, especially if I join it 90 episodes in (if it's a brand new work with only a few episodes I often catch up right away), but I WILL read it!