Payup, PAL

Apparently, PayPal is not a limitless resource.  Once you've used it for $5,000 worth of transactions, over whatever period you've used it -- they require that you either sign up for their credit card or tell them a bank account number.  The reason is ostensibly for 'security', but in fact it's because the bank account number will become the default payment option.  It turns out that it costs PP less to process a bank transaction than a credit card transaction.

And here I thought it was a useful, low-impact service....