Should an egoist refuse an overly generous, altruistic tip?

Recently, I read a news story about the former president of PayPal leaving huge tips for servers at restaurants around the country. On the receipt, he would write "TipsForJesus," and the tip was often exorbitant. For example, on a bill of $88.78 the tip was $3000. It is wrong to accept these tips -- particularly given that the customer is motivated by altruism and religion?