I actually didn't like that episode because she very clearly said she spent no time looking at the product and just clicked buy. But there are legit reasons to want a UK plug in the US (maybe you're traveling and want to have it with you when you leave). The fact that the seller is trying to game the rankings is more an issue with the rankings system than with the seller.

Gaming the rankings/listings isn't an issue exclusive to amazon, every single website has this issue, in fact even phone books (remember those) had to contend with people listing their name with leading A's to try to get to the front. Gaming listings is as old as lists and until we can come up with a solution to that problem we're always gonna have problems like this.