Hmm. I personally dont really comment when I fave. Even when the person requests for people to do so. :/ Loads of people don't, so I don't really see the problem. A fave is like a positive encouragement, it means someone likes your work! xD
Generally when I favourite something, I try to comment on it, but if I don't have time or I'm at a loss for words, I don't. I personally am not to bothered by the whole comment-if-you-fave thing.
I personally am not to bothered by the whole comment-if-you-fave thing.