To be completely fair, the roulettes exist as they do, functionally I might add, in order to fill the need of other players. It's unfortunate that you don't enjoy a particular instance, and that the reward in the roulette is not enough to stave off your dislike, but allowing a particular function that ostricizes particular content is counterintuitive. You'd strand players who either need to do particular content or at worst, cause developmental loss to the game's functionality.

Again, sucks you don't like something, but just think, it isn't about you. It's about the greater good.