I'm not talking about like "buy Awesome FPS 2, get Awesome FPS 1 in a bundle for $1 more", I'm talking about bundles that collect a bunch of disparate games. People buy these bundles because they only want a few of the games. And then companies like Humble Bundle sell bundles where you don't even know what they contain until you buy them, so it's entirely possible to buy a bundle where you end up not playing any of the games in the bundle.