Nothing. Why don't you give them your salary? It would go farther there than wherever you live.
Or, to be less snide: Kin selection, but with memetics rather than genetics. To be more simple: cultures whose behavior patterns perpetuate the survival of their members, survive themselves.
Or, to be less snide: Kin selection, but with memetics rather than genetics. To be more simple: cultures whose behavior patterns perpetuate the survival of their members, survive themselves.