I've noticed some people getting annoyed that I don't really respond to comments and messages anymore. The reason I don't is because ... well, I've sort of stopped using DA. I mainly post my art and stuff on my tumblr(s).
So ... yeah, if I don't respond to a message, or a note, or whatever, it's nothing personal. I'm just not really on DA any more. I only post a few of my favorite pics a month now because I'm so wrapped up in other things.
It's not like I don't come on anymore, or will delete my account, but I'm not going to respond to dozens of "nice job!"s with dozens of "thanks!"