I'm not sure why a lot of those are up there. If KC'ing the card is strictly superior than just playing it without KC, then it's not even worth talking about. Yeah Goons doesn't give you more points, but +$6 and +3 buys is not bad at all. There are a ton of cards which the KC makes no difference for: Counting House, Outpost, Tactician, Treasure Map, Watchtower/Library (almost).
Of course the real winner should be a card which is almost always worse to KC, than play without KC. Madman probably does win that, but I think Rats makes a good case.