How about that platform receives a huge delegation from STINC and would upvote the best comments according to the beneficiary payout instead of direct payout..
Oh.. Wait..

Your idea is nice, but steem seems to work better with delegations.. And not any initial invest. As weird as this might sound.
But it would need constant monitoring.

Hmm. Why payout?
Another idea would be to give out delegation.
You had 5 good comments? Here have your X SP as delegation from us..