They do sell cards on their website and they also direct users to websites of other manufacturers (like eVGA). The problem is nVidia had no protection against orders being placed by bots at the first second the cards go on sale, so it was virtually impossible for a human to order the cards, so the middle men got all the cards.

Between the high demand with gamers, scalpers with bots, and crypto farms gobbling up _graphics_ cards, the prices went up by an insane amount, and some people did pay double to get their hands on it.