I had looked several times before at buying a Straight Dope t-shirt, and was always thwarted by the Reader’s commerce pages failing to accept AMEX. Then hope appeared, as when I subscribed, I was able to do so with my AMEX.
But recent checking of the commerce pages reveals no AMEX option. I wonder, then, is this just an oversight? Now that the Reader has obviously established a relationship with AMEX, would it be possible to soon acquire SD goodies with an AMEX?
I think that the subscriptions are handled via PayPal, whether directly or indirectly. That is to say, the Reader has a business relationship with PayPal, and PayPal has a relationship with American Express, and via this connection, it is possible to subscribe using AmEx. But the Reader does not have a business relationship directly with American Express, and the “Buy Stuff” page is handled completely differently from the subscription model, so the connection with PayPal is not relevant.
At least, I think that’s what’s going on. But I’m just another nobody (at least so far as this is concerned), so I may well be mistaken.