Or, you can read this thread on blues where a user had experience with their games DRM giving them problems as legit customers. Again, just because YOUR experience is different, it doesn't invalidate all others.
I've always been a fan of more practical DRM. The kind that turns your pirated release effectively into a demo and potentially into some sales is probably a better idea than goading users onto a forum where you can mock them and ensure they will never become a customer. Many indies upload their own games to torrent trackers, they're effectively demo builds designed to get eyeballs. That's a very smart way of handling it, the game will be cracked no matter what and you might as well get the potential to make money out of it.