Paypal shut-down payments to Bitcoin-related accounts as quickly as they find them. Per our current Acceptable Use Policy for Money Service Businesses, PayPal

Paypal shut-down payments to Bitcoin-related accounts as quickly as they find them. Per our current Acceptable Use Policy for Money Service Businesses, PayPal may not be used to operate a currency exchange, bureau de change or check cashing business including the sale of bitcoins, bitcoin mining units, and other related bitcoin products. Via and Mastercard aren't far behind them.