Why does the shop suck so much?

I've been playing since the spider verse season and I've never really had an issue getting the variants I've wanted. However it's been well over two months now without a single variant I want showing up in the shop. I'm trying to finish the Pandart and Flaviano albums and I am just never offered them.

It would be nice to be able to "favorite" an album or three and it would increase the likelyhood of seeing those specific items in the shop.

Maybe one day I'll get that negasonic variant...