Assuming they pay their credit card bill themselves, it's effectively a volume discount for big spenders (though that "volume" goes to multiple vendors). The argument that the money "comes from" other customers is sort of like claiming that when you "save money" by buying things on sale, the money comes from other customers who paid full price. Actually you aren't "saving money" at all; you're spending money.
Similarly, the "whales" in a casino get lots of "free" benefits, but only because they're losing a lot of money gambling. They paid for them.
Contrast with frequent-flier miles where businesses pay for plane tickets but the points go to individuals. That's pretty clearly siphoning off business expenses.
Similarly, the "whales" in a casino get lots of "free" benefits, but only because they're losing a lot of money gambling. They paid for them.
Contrast with frequent-flier miles where businesses pay for plane tickets but the points go to individuals. That's pretty clearly siphoning off business expenses.