Would make entering credit card details etc a lot easier... heck this is one step away from having an account based system that we all want! (nintendoworldreport.com)
We will never ask for credit card details or any other form of payment. (fsat.ru)
But once you've confirmed your email address and membership, you're asked to provide credit card details even though it's supposedly free. (top10sexdatingsites.com)