I like the idea!
Thematically it feels a little off to me, what about this screams aristocracy? I would think that would have something to do with face cards.
The unlock mechanic could be boiled down to: "Purchase everything in a shop that has 2 or more rare baubles". Is that correct?
Mechanically, It does sound fun and seems relatively balanced.
I'll give it some thought! Thanks for all your ideas and engagement, I genuinely appreciate it.