Well, the most my upvotes can possibly give me, even on the very best content (I upvote when it has under 5$ at 15 min and it goes to 3000$+) is a couple tenths of a cent. So it really doesn't matter what I upvote.
I upvote after I comment to get the author (or others) to reciprocate.
Agreed. Upvote only give good money if you are a whale. The best is to comment a meke new posts.