Selling hard copies does not violate the GFDL. The only thing that would violate it would be if the copyright information were omitted or altered in ways that the GFDL does not permit. (Also GFDL documents can have "invariant" sections that must be maintained intact, but the Gimp documentation doesn't use any, as I recall.) You can of course write to the sellers and suggest that donating some of the profits would be the *right thing to do*, but they are not legally required to give that any respect.
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