Why would a small business help Amazon?
Amazon is competing with them, at least if they're a retailer rather than a sandwich shop. If I owned a retail shop I wouldn't use this as it would help Amazon. You know if this is successful, Amazon will have their own card at some point that allows them to keep the whole 1.75% and cut out Visa/Mastercard. Then they'll offer people deals for using it at amazon.com. More incentive for your customers to buy online instead of at your shop, and quicker path to bankruptcy for you all because you were seduced by a short term savings.