Begging for upvotes only makes you look petty, especially if you comment on someone's meme and don't upvote the meme. No one has any obligation to look at your memes and comment just because you comment all the time on their meme. But if you're going to comment on someone's meme, the polite thing to do is upvote the meme. And when you reply to a comment, it's common courtesy to upvote that comment.
If you just don't feel like upvoting someone because you never see them on your memes, then maybe this isn't the best place for you. Or maybe just don't comment on their memes.