Adding an optional bidding system is an extra complication that I could perhaps add later, but I don't think it would be required because the free market value of votes would be pretty obvious given which offers are getting bought and which ones are getting ignored.

I think it's safe to say that you could sell your votes for slightly more than they are worth, because there is extra value in exploiting the garbage trending tab.

However, this also brings up the question of curation and using vote buying to manipulate it. If you buy votes the second you post something you'll receive 25% more money than if you waited half an hour.

It's pretty obvious that the advent of vote buying popularity has created a need to give
curation a complete makeover. I've been saying for a while now that curation should revolve around resteems.