Was playing poc last night and teammate suggested that they should give an extra tooth when you complete all challenges during a game. At 1st thought it sounded good. The only drawback I see is that people might quit more often if they failed a challenge early on. There's really no reward to complete every challenge once you have completionist..sometimes players don't want to go for the more difficult challenges late in the game and this might be the incentive they need.
Not sure if this is a good idea or not..just thought I'd throw it out there for some feedback.