Honestly, I find this whole comment before you favorite spectacle to be a bit silly.
YES, it's nice to get comments. I understand that. However, 90% of the time your comments will be 'I like it" - or something along those lines..... which is exactly what a favorite says. If I get comments I either want critiques or some in depth reason WHY you like it. I don't mind the "this is nice/pretty/etc" comments but overall I'm not going to complain if people favorite something and don't comment.
When I comment on a piece, the chance is I'm not faving it because, usually, I'm critiquing it. That's not to say that I don't leave my share of "WOW! This is amazing! I really love the *insert art term babble here*" because on really outstanding pieces, I feel the artist deserves to know exactly what it is about their work that makes it stand apart from others. But when I critique it's usually on a piece that I feel could be pushed a little further or a younger artist that could use some general advice on how to improve. Usually at that point I'm not really interested in the art itself but believe the person drawing it has potential and feel like they deserve more than a cursory glance over his or her work.
But there's a whole bunch of art that I just find inspiring so I just hit fave - but when people SEND ME A MESSAGE going "please comment before you fave." FIRST of all, I never do that - I always favorite before I comment (lol). SECOND, I like your art.... but I'm not blown away by it. If you look at my faves, I have HUNDREDS of images. If I commented on every single piece, I wouldn't have time to live my life. I'd spend all day on devART commenting on stuff.
So... I'm sorry if this offends anyone but seriously, I don't think people not commenting is really that big of a deal. Not everyone is going to give you valuable comments and a fave says the same thing as typing out "I like this, duuuurrrr."
And for the people asking for this simply so their gallery stats go up, FOR SHAME. This shouldn't be about who has higher numbers. You should be content with the fact that your art is appreciated and makes others happy.