When it comes to games, I buy it if it can't be obtained through normal gameplay. Like... If I can get it by grinding, I'll usually opt not to. There are a few exceptions, though.

>Stares at Sylph wings on Mabi main

But yeah, I'm all for efficiency, though. Also, wouldn't a cash shop clearly set apart the betas and ostracize them to hell and back from everyone else? I'm pretty damn sure that Kayaba wants to see a world where people aren't at each other's throats over fancy hats, especially on the first few floors.