You know, I kinda want to farm for 300 gacha stickers (I need a little less than 45k more stars --- ouch), but I'd probably get the CHU2 card before I even reach that because of how many stars you need for 300 gacha stickers. It's insane. They really need to lower that price. 300 gacha stickers is 75k stars. You have a higher chance of getting the card you want before you even reach that amount of stars.

Okay, I just did some calculations, and if I clear and get SS rank on every song I haven't cleared on hard and FC every song I haven't FC'd on hard, I'll get 13700 stars.