naahhh, It's fine , I understand them I mean you'll probably do the same if you get tons of comments following each other one by one. You'll get happy to see and read them but sometime it could be tiring specially when your works/arts are popular y' know?
I typically don't mind. The only time I get bothered is when I leave an especially long/insightful comment, wanting to discuss more about the topic in consideration, and I notice that the artist replies to all other comments but mine - even the completely generic "This is awesome!" comments. But really it's more of me just hoping to strike up a conversation; it's not that I'm "annoyed." If they don't want to, if they don't have anything to add, then it's a-okay.
I don't mind at all when artists don't reply to my comments. what I don't like is when an artist never replies to ANYONE'S comments. time may be an issue, but when you don't reply to any comments it makes it seem like you don't give a crap