The only reason I keep the same avatar all the time is because this is the only forum I've used that doesn't have a User Picture in the profiles and I feel weird being all "anonymous" on the internet. Having my actual face out there feels more real, I suppose.
I sometimes like to think the interactions on a forum like this form interpersonal relationships that transcend text and using my face as an avatar makes it seem like that's true, maybe? Who knows? I'm just rambling at this point. Carry on, then.