Microsoft if you are listening, I have never bought a used game and I have never felt that on great titles the retail price is unfair. What I would object to is any system that prevents me from taking a game that I pay for over to a friend's house to play. If I can only play a game on the console box I registered it on, or I can only play it while logged into MY Xbox Live account, I find this to be an unduly restrictive practice. If this is the case, I will certainly not be buying the next XBOX system.
Some things to ponder. We all talk about gaming as a community. I did not buy a console until I was 30 years old. I bought one because many of my friends had one. I bought an XBOX because it was what most of them were using and I wanted to play the same games they were, and play many of those games WITH them. Not just online, but getting together for a night beverages and Tiger Woods, Rockband, co-op Gears of War etc.
Because I bought an XBOX, my brother and two of my best friends also bought XBOX. When one of us bought a game we would bring it over and share. More often than not the other guys liked a game and would buy it as well. Community, sharing. Because of the possibility of that interaction and sharing 3 copies of Rockband and all of its sequels were purchased. Three full sets of Rockband equipment plus replacement parts over several years. Between the four of us, easily thousands of dollars worth of downloadable content for Rockband, Borderlands, Red Dead Redemption and others was purchased. When new and exciting games were coming out, we would share conversation and anticipation. When I bought Lego Lord of the Rings I brought it over to my brother's house to play co-op with him. The next day he bought a copy. Do you really want to destroy that kind of experience?
I would advise you, Microsoft, against any measure that would prevent all this from happening. You are going to kill what grows your brand, your reputation and your appeal. If you build something that I cannot easily share with my friends, I don't want it. We will find something else we can share.