Lottery Tix system for subs.
Give lottery acces tix for subs (tier 1 or prime = 1 tix, tier 2 = 2 tix, tier 3 = 3 tix
Lottery give acces to computer hardware goods, like high end GPU or stuff like that.
That would improve viewer interest to support streamers. I think there's a lack of interest in current twitch state, besides removing ads and virtual cosmetic.
Or you can even create a blockchain and induce kids to learn about finance and trading :) Giving em some free coins for supporting their favorite streamer.