Sal is right about all that stuff with the album variants, and yet...I don’t understand why they don't just MAKE ALBUM VARIANTS DIRECTLY PURCHASEABLE FROM THE ALBUMS and rotate the shop through everything else! Sure, whales would blow though all the album rewards in a hurry, but whales are gonna whale anyway.
Because adding that kind of functionality takes a lot of work and time for just a quality of life feature. And they've already done a lot of updates like that, so who's to say they're not working on it already or will in the near future.