I hereby request that instead of rejecting upvotes for more than 7 days old posts (paid out posts) ask the voter to power up (or buy more HIVE). There are several reason users specially from eastern countries ready to do that
1- I see a post and I want more people see it. Users don't re-post them if you expect so, because:
a. There were arrests in my country for re-tweeting posts government don't like. It is redistribution of content
b. Lots of users prefer when a visitor see their profile don't see others posts instead of their own posts.
Beside If you want a post be seen in a topic trending list, only way is upvote
2- Supporting independent author/platform. Asking for tip (donation) to the author isn't a working technique but if you ask instead to invest in a cryptocurrency, especially such useful one, there is a good chance that it happens (I personally have this psychological mode)