I wouldnt feel good with AM accepting credit card payments. Thats way too risky. Similar to getting paid with paypal.
So all the websites that accept credit cards are doomed and should immediately stop ?

No, but this is a BTC business and it is in all of our best interests that they only sell for BTC.
I kind of agree, but kind of disagree too.
Selling mining gear in traditional currencies might engage people who cannot get hold of BTC otherwise. Then again, selling for BTC grows the "bitcoin economy". In my opinion, one doesn't need to necessarily exclude the other, as long as risks are properly considered...