So both Heaven & Hell reward you w/ Reputation to unlock rewards with for completing quests. The problem, however, is that once you're at 200 Reputation those quests become meaningless because there's nothing left to unlock, especially when you unlock their respective special tools and can just reach 200 Reputation w/o doing a single quest. So, how about once the player reaches 200 Reputation, the quests reward you with either NF/DS and/or BB. Maybe 2 of whichever currency you get?

Edit: Some other players said that they do get some BB and experience in addition to Reputation, but neither the reward flavor text nor the user log mention this, and this doesn't solve the problem of Reputation being useless past 200 Reputation.