Y'all know about Optimaes, right?

Well despite being into gift economies, now that I'm gloriously unemployed, I still need to eat. So, I was casually looking into the Amazon Honor System tip-jar thing but they only support US card holders.

So here's a suggestion for Amazon. Why not allow tip-jars to count towards books. Any dollars that are given to me turn up as discounts when I make my next order?