Block chains are not zero value, they are going to become vital as digitization increases. Whether or not Bitcoin lasts is one thing, but the technology behind it is not going away.
I have a VISA Debit card in my wallet.
The price I see online is the price I pay.
I’m sure Amazon gets a good deal on merchant card fees.
Blockchains yes, bitcoin? Meh. It’s rate limited in terms of transactions, making it pretty useless as a means of everyday small payments.