Amazon pays foreigners in Amazon money in order to avoid the currency problems with paying in local money everywhere for affiliate and global partner programs. Purse.io provides one way of converting the amazon money to locally spendable money after they have bought all the junk on Amazon that they want.
Right, so who is buying BTC in your scenario? Foreigners seeking to cash out into a local currency? The number of countries with a currency that Amazon won't touch must be very small, and the number of businessmen interested in such a convoluted system in said countries must be even smaller (the number of entrepreneurs in those types of countries isn't going to be large, period). That does not sound even remotely plausible as a business model.