I think it depends solely on the setting and locale. I mean, if your character(s) are in a medieval fantasy realm where colors are different than the norrm, it would be nice to include colors to toy with the reader's imagination. Same goes for exotic locations, like islands, jungles, etc. And especially if you're in a different universe altogether or another planet. 
I love comics with color but understand the hardships faced to do the extra efforts.