I wouldn't see any reason not to. Though please keep in mind that smile.amazon.com is a marketing stunt. Firstly, it makes people less reluctant to buy increas

I wouldn't see any reason not to. Though please keep in mind that smile.amazon.com is a marketing stunt. Firstly, it makes people less reluctant to buy increasing Amazon's revenue and secondly, Amazon is donating the money, so they get to pay less tax.