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. And if they learn what bounties are on the 1st week of their forum life, they can surly wait few more weeks to join bounties and wait the normal activity.
Sure this can be a problem for users that wants to open an ANN bounty but hey we have the Copper option and 20$ for a CEO of one ICO are nothing.