I'm just checking Amazon Associates Programme Operating Agreement (the part about Qualifying Purchases) and one thing is bothering me. How do I (or how does Amazon) know if order placed through my affiliate link is not "purchased for resale or commercial use of any kind"? Is it possible to check it?
There is no real way to check this... Amazon might have an internal system to check accounts which are buying items in bulk. And of course if you buy items via your own link then that will be detected. The worst Amazon would do is take away your commissions for those products.