[claudiawerner]

>why would it matter where you're sending a portion of your so-called "wealth" when you're getting something in return?

Perhaps the "wealth" you're sending and what you're getting back are qualitatively different and you have reason to prefer one over the other. Or even more simply, perhaps what you're getting in return isn't worth more than what you're giving. As an aside, in the philosophy of exploitation, it is entirely possible for exploitation to exist even if both the exploiter and the exploited benefit in some way in the transaction.