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> And excusing Amex - why is that?! Fees alone?

To be fair, the core AMEX product is a charge card, not a credit card. They have more recently expanded into a few credit card products. I don't know the exact details, but my understanding is that the charge card system is more merchant hostile than the credit card system and more than simply larger fees.

[bdangubic]

but we are establishing here that companies (like Costco) have the right to choose which payment methods they allow in their store… if they can (of course they can and no one should stop them) then they can - end of story