I have found the entire reward system is broke. To me it's the old bait and switch give you some awesome drops and once you hooked they take them away. As for them working as described. I almost have 100 days invested in the game and I am telling you it's broke. I had 70 3 of coin on 54 left I got an exotic. that is more than a 1 in 8 chance. It also seems that the higher your light level is the worse the rewards are.