EBay’s highly criticized fee changes—lower listing prices but a 67% increase in seller fees—kicked in last week, and next month eBay’s payment service PayPal will start holding certain deposits for up to 21 days if PayPal considers the transaction “high risk.” PayPal earns interest on any money it holds—and it’s perfectly legal because PayPal is a deposit broker and not a bank. If you do find your money stuck in “high risk” detention, there’s only one way you can attempt to earn money from the delay, and that’s by sticking it in PayPal’s Money Market Fund.