I still can't say that I've heard any customer, ever, ask about some sort of a system that would allow them to buy someone else's domain name registration just in case it expired. Of course, I'm not really involved with the day to day of our domains operation anymore, so they might be beating down our door, their just not talking to me ;)
[obApology: My sincere apology for bringing up an ICANN related comment. I promise never to do it again ;)]



