Sometimes your post can be interesting to many people, but there isn't any whale out there that cares about your post. So you get upvoted decently but earn 2 cents. So it is totally out of your control. Therefore, the best thing to do, is to keep posting because you love doing it and not care too much about whether you gain money out of it or not. You will become better at it, and who knows ... maybe 1 day some whale out there likes your post and upvotes it.