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Originally Posted by MasterD  You are right about a DW not willing to cook for people who will never return the favour |
I believe a DW can very well be willing to cook for people who will never return the favor: in order for other (useful) people around to think he's such a generous nice guy, for instance, or that he's so fun to be around. They think in more complicated ways than just "will they give something back?".
It's like a company giving you something for free during a PR action. They don't care whether exactly you will buy something from them afterwards, it's more that it just generally looks good and draws attention to them, so that even people who got no present will end up buying something.