My motivation to post any pictures of myself here is pretty much nil... so I can't honestly say. Though I would imagine guy's post their pics for the same reason you do. Like I said they don't think they're hurtful comments are ok. They know they're not. Chances are they don't think they're deeply hurting peoples feelings either. I've trolled before (not with insults mind you). It's pretty satisfactory just knowing that people are dumfounded at your pretend stupidity.