You've probably already broached this subject, right? I mean, you've used your web analytics package to thoroughly analyze the future value of customers, right?
AMEX buyers are different than Visa buyers ... Visa buyers are different than Master Card buyers ... Master Card buyers are different than Discover Card buyers (pay attention to the Discover Card buyer), and Discover Card buyers are different than PayPal buyers.
And then, if you have proprietary credit, you've got a whole 'nother set of exciting challenges.
It turns out that the method you choose to pay for your merchandise plays a role in determining the future value of a customer. And this is such an easy thing to analyze, isn't it?
So just do it!