Why couldn't they have watched over the Grubbs because Steef are strong and Grubbs needed protecting? I think we're supposed to see the Steef as noble creatures, ones for whom reciprocity doesn't necessarily matter. Or if you're one of those Ayn Rand people, why not say that they protect the Grubbs because the Grubbs are the underdogs and the Steef get to feel important?
I don't think the exchange of material goods is a factor. That's my basic point.
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