There may be something to that. They review new guns in some of their magazines. They also are the voice for gun owners, as you mentioned. Whether the issue is political, legislative, or legal in nature, the NRA will get involved if they feel that Second Amendment rights are being trampled. They will also fight for manufacturers to continue to manufacture guns.
I imagine they enjoy the increased demand for guns. Increased profits are what all businesses strive for in the marketplace. Of course, it is not their responsibility to follow purchasers around to make sure that they always use the guns responsibly (as the rash of recent lawsuits claim they should). If the guns are leagally sold from the manufacturer to a licensed dealer, then the responsibility of the manufacturer ends.