I get a lot of comments from people doing so just for the vote and I'm sick if cunts like that so no votes will be forthcoming if I feel their comment is disingenuous.
I had one this morning, a random shite-comment from someone I don't know and I wrote back, "yep." No vote.
I then went into one of my communities and sure enough, a post from the same person. (I'll give it no vote either.)
Effort and consistency after reading my post...and not 300 word comments, is what I'm looking for. It creates better relationships and that will win them more and bigger votes from me.