Another ludicrous claim. Whether or not anybody is ever 100% altruistic is as you say a philosophical question. What isn't philosophical is a basic distinction between a sale and a favor. If you'd permit yourself a bit of intellectual honesty you'd see that right away.
In a sale, actual money changes hands. On the spectrum of selfish, a sale is indeed further to the right than a favor which lacks money, I do grant you that. How's that for intellectual honestly
. I was the one who said earlier that money is the prime motivator behind all human behavior.
I am merely pointing out that a favor- which lacks a transference of money- there may exist a transference of other unquantifiable/intangible assets. It's not healthy to look at the world that way IMO, and better to appreciate everything you take enjoyment/pleasure out of than (almost) nothing.