That´s a good question.
In the meantime, you are no doubt aware of the forms of payment that chess.com DOES accept ...
http://support.chess.com/Knowledgebase/Article/View/74/0/can-i-pay-for-my-membership-by-check-or-money-order
Upgrading...
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I've been a member of chess.com for a long time now (more than a year) and I haven't upgraded yet for a simple reason. You do not allow membership purchases via Alertpay. Paypal doesn't have my country listed, so I can't make an account there, but I have an Alertpay account. So, why exactly do you not allow purchases via Alertpay? It's a popular money processor and almost every site has it. Are you ever going to implement Alertpay as a payment processor for your site?