joe, some of us are justifiably concerned about letting our real identities out on the web. There's some bad crap going down on the internet, and protecting real identites is just a good way to help stay out of the soup.
An interesting aside. I bought something on eBay yesterday, and was notified that my card wouldn't work. Concerned, I contacted my bank and found out that the whole State of California was temporarily blocked, as the fraud level was completely unacceptable.