You've never seen a currency buff in a game before??? They're crazy common in MMO's. And you don't need them to get glimmer drops from enemies - they aren't necessary ... they just increase the amount you can get. TBH I find them rather useless unless you are using them to specifically farm like ultra mobs. Very much like XP boosts which are more effective with bounty drops than actual kills. Since they're timed based, you get more bang for the buck with larger rewards.