Lots of people here have been burned by Paypal/eBay.
Buyer buys ASIC from seller.
Buyer mines for a while, then files claim on Paypal that unit was not as described/defective, whatever.
Paypal freezes the seller's funds while this is sorted out
Should the seller win the claim, the buyer then does a chargeback for the original purchase and then the seller's funds are frozen again.