Well here for example warframe has a daily reward system for logging in, and what they do is they have the items you receive be next to nothing but it encourages daily log in for two reasons... one being that after increments of 50 days of logging in you get a good reward instead of the bad ones that you usually get. The other reason is there is a chance to get large "discounts" on platinum -25% -50% and -75%(maybe tb could do this with boosters, QI, TC) so i guess tb could do something like this if they make the items untradeable, or make the tc only able to be used in the shop (small amounts only so its rare to get the tc). With the every 50 days you get a good untradable item it would encourage daily play, and with discounted boosters, QI, TC thing it would also potentially generate more money for the game.

Tempest I think the original idea isn't that great because of how many high QI people there are, and also its been said already but it would really mess up the game economy.