No, they buy votes after 6 days for two reasons:
- It hides the upvote, as many 6 day old posts are buried and forgotten
- There is less time for someone to flag the post.
The actual return on the upvote purchase is the same. Point is, raping the rewards pool secretly is not helping this platform.
raping the rewards pool period is not helping this platform!
Unfortunately, as long as vote bots have a positive ROI, then rewards pool rape is a given.
It's a hard problem to solve but if we as a community can do it then steem will be worth a lot more, it's already good as I find a lot of good content but spam pollution does annoy me.