5. Is there a fee for using Amazon WebPay?
No, there is no charge to send money using Amazon WebPay.
Amazon would "make money" with access to interest free funds (money sitting in accounts), and by having more people pay for purchases via ACH, saving on credit cards fees.
But the interest they could make on the float is nothing compared to the tithes they pay to the credit card companies, especially with the damn rewards cards. Just getting their prime customers to sign up for EFT, for normal Amazon purchases, has got to be worth a fuckton of money to them.
compare to PayPal:
The user agreement says that the difference between a personal account and a business account is that personal accounts may not receive credit card payments.