Grossly over-pricing and object on Amazon or eBay is a common way of laundering money.

Nobody else buys the "book" at $400, but the guy with $40,000 in drug money "buys" a bunch of copies from the "seller" money changes hands, invoices are created, and the money gets cleaned up.

I won't even go into the way a similar technique is used on eBay for human trafficking in child sex slaves. Suffice it to say when I learned about it I nearly vomited.

It's damn near impossible to eradicate.