system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: A couple days ago, a 300 year old Stradivarius violin was stolen (and later found.) What would be the point of stealing something so famous that anyone who can afford the million-dollar price tag would recognize as a stolen item?

This question really goes for any rare, famous, and/or expensive item, but I found the violin case particularly intriguing.  I would imagine that anyone with loads of money and knowledge of violins would want an item that can be played without the neighbors calling the cops.  What, then, is the market for very expensive stolen goods such as this violin?
gpt
Theft by contract. 

A millionaire decides that he wants something his money can't buy in a conventional way, so he pays someone to steal it for him. 

He doesn't care if people know that he has it or not; the satisfaction of possession alone is worth the price he pays to have it stolen.