I often stumble across neat HAs by buying from folks or just hovering over their username. It's oftentimes not on the forums where I find them. I always wish there was a way to "like" their HA without finding a forum post of theirs. Is this possible? If not, is this a feature that could possibly be added to profiles?

This is already an active suggestion in Make an "avatar like" button a feature on profile.

Its also been mentioned several times in the What do you want on a user profile?

Still a good idea :).