http://www.cnn.com/2010/TRAVEL/04/30/destination.weddings.dilemma/index.html?hpt=C2Thoughts? I don't think most people on here who have DWs expect everyone to come. I've never been invited to a DW so I can't really comment on the friction and awkwardness this article talks about.
If I was invited to one for someone I was close to I would probably go and make a vacation out of it. It would have to be a close friend or close family member, though. Right now so many of my sorority sisters are getting married in the midwest and I can't even afford the vacation/money to go to most of them.