I post pictures for several reasons:because I like when people like my pictures because, if I'm going to make comments about other people's pictures, I think its only fair that I let my own work be available for comment.
Public exhibitions don't mean too much, if anything, to me because most of the relatively few people who see work in person have zero idea of what good work is and so their approval means nothing to me.
I obviously can't speak for anyone else but I can tell you why I don't look at your work. You don't respect what you do enough to submit finished work, you deflect any comments by saying that your work is just 'stuff' that you threw up here. Clearly you have no respect for what many of us are trying to do and thus I have no interest in anything you do.