I collect a lot of images, and it's very disappointing supposedly having X new comments, but all of them turn out to be some copied or at least generic "thank you" message.
You know what I do when someone favs an image of mine?
I look at their gallery. I don't always leave a comment or fav in return, that would be insincere, but I look.
Whereas anyone who leaves a copypasted "thanks for the fav" is too wrapped up in themselves - in the case of people who link back to their deviation, too wrapped up in the obsession with promoting themselves for sure - to have a look at my page. Which included a "please don't thank me for favs" stamp. Maybe this will help. *point at the top of the journal*
Why I don't like it?
Simple. I come here, message centre says "5 new comments", I check, and each of them is an absolutely pointless, generic, "Thanks for the fav". They're a waste of time and server space.