People can be very cheap with upvotes, as if they cost something when it's just basic courtesy.
My fave was when a certain popular former memer posted a mere "lol" on an meme and got 4 UV's. The OP got 2, 1 of them from me! He'd post "lol" or that Robert Downey thumbs up template - no comment - on countless memes per day, racking up the points. And for what? He finally had to quit because he was negelcting his own family just to post that stupid pic on practically evert featured meme, just for points! Wife, kids, job. Like, he ALREADY had a happy life, sheesh.
The best thing is to circulate on other memes, interact with people and they might do in kind.