The problem is that it is a nonsense if you read it literary. However, it is *not* a nonsense if you are reading this in the sense of buying Wikipedia content (which is a common sense of, for example, "buy Wikipedia"; cf. "buy Linux"). At least, Google should exclude Wikipedia from its common commercial add ons: "buy Wikipedia", "trade Wikipedia" and similar. Anyone who wants to make money on Wikipedia(tm) should pay for (tm) at least in USA.
Is anyone making money of it? Do you have to pay to be on the "Buy XYZ" results? And do any of the results actually sell anything to do with Wikipedia, or look like they do?