They could easily integrate a reward system for roulettes.

Example: A NPC Contact made for redeeming some kind of toke (cookie, pie, gold star, turd w/e). Each time a lvl 50 runs a roulette they get a toke that can be redeemed at the NPC for a list of items that you can not get otherwise. (more vanity/craft items, like the rarer dyes you get from retainers, or rarer ingredients for crafting). And keep the "daily bonus" as a double toke reward.

The low level progress in story and the high level gets a reward to play with. Everyone is happy

Only thing I wish they'd do with the roulettes is separate primals from them and give them their own roulette...