This is a risky idea that can promote the sale of merit especially for accounts that already have redtrust. In my opinion it makes more sense to eliminate the newbie accounts from the bounties, I was newbie myself last year and for the first few weeks I did not even know what the bounties were. According to my experience, the newbie who sign up for the buonty are 99% alt abuser / ban evader.
Increase the difficulty a little bit and the number of spammers and especially bots will be reduced by half.
I post this topic before being fully aware of the amount of spam made in KanadeCoin topics (over 4000 posts in few hours).
Imo, trading merit is happening and may increase with this idea, but spotting the abuser isn't hard and may even lead to figure out some accounts promoting bots.
BTW, i don't think that they will spend a cent to enter to bounties.