Sure, there are some asshole "pirates" who never buy anything, but I believe that most people buy things that they think are worth their money. People like buying things, but they don't like wasting their money. One way to avoid wasting money is to make sure that you like something before you invest in it.
As the Valve philosophy states: "piracy is a service problem." Inconveniencing the people who buy a product with restrictive and intrusive DRM is a service problem. They don't want to deal with it, and they want to discourage those practices by telling them in the only language they understand. (money)
DRM never stops piracy and never will. Piracy is an inescapable fact of business and no amount of DRM will ever stop it. The sooner the industry wakes up and realizes that intrusive DRM is a waste of time and money, the sooner everyone can be happy.