http://blog.wolfire.com/2010/05/Another-view-of-game-piracy
With the Humble Indie Bundle promotion we've seen that when we treat gamers as real people instead of criminals, they seem to respond in kind. Anyone can get all five DRM-free games for a single penny, and pirate them as much as they want -- we have no way to find out or stop it. However, in just the first two days, we have over 40,000 contributions with an average of $8 each! Would we have seen this much support if the games were console ports that only worked when connected to a secure online DRM server? We'll never know for sure, but somehow I doubt it.