Maybe they could make it so once you collect all the available rps hats you can challenge the rsp king again or whatever his name is thats in the graal city bar. You would have to win best of 5 instead of three this time,and you can unlock the ability to challenge all of the rps npc's again. Or some other kind of special ability,possibly something short term that would require you to beat the rps king after a cool down period. Like something that could be done daily.