When I buy a bundle, I look at the number of games that I am interested in. Other games can be a positive (because the game turns out unexpectedly good) or a negative (because they make it harder to find the good games), which kind of balances out. Those huge charity bundles actually had some great games in them, buried under the mountains of trash. A lot of the smaller, more focused bundles don't have anything I like. Therefore I will continue to buy the huge charity bundles while being very careful about the smaller bundles.