This is what I meant by using card of strangers/not so close friends. They are already giving you instant discount opportunity so why would they also give you something extra unless you are quite close with them. As for cb sharing agreement, same logic as it takes 45-60 days so unless you are very close friend/relative no one would bother to keep track of all this cb & then transfer it.If it's smaller amount, maybe CH could pass that off as discount to buyer immediately or on product delivery. If it's a higher amount, buyer would have to trust the CH to transfer the cashback once it's credited, I would suppose. Or they may have cb sharing agreement.