No money, no information!

I was checking Nielsen Norman Group’s website, where they talk about the forthcoming “User Experience 2005 Conference” to be held in Boston and London.The topics will be amazingly interesting: Information architecture, usability, user experience, web content management.Everything seemed great. I was ready to register … until I saw the prices … And these do not even include the hotel room, plane ticket and extras.Now, can anyone explain why these conferences are always that expensive?