I remember around 1999 when I used to work for a big ISP and I ran a simple perl script that would "nslookup" all combination of 3 letters domains. It generated a huge list of available domains, but none that called my attention because all the good ones (not just random letters) seemed to be already registered. I would never thought that all those random 3 letter domains would sell for so much money many years later! :-)
I don't understand why all of these replies from the big companies come with something like "we are not able to revert this decision" somewhere in the text. It shows such an arrogance!