Why? You bought the games. It's like going to the store, buying a bunch of clothes, and realizing after a few months that you don't want them anymore. They cannot be returned.
They don't say how they come to that number in the article, so I assume they are using non-sale prices. I know that I've gotten some bundles of games in the past that were 95%+ off, which I bought just for the one game because it was the same price or cheaper.