Yes, in a way it would make a lot more sense, but that is the way the UBB software is written for the site. Once a login/chat name is chosen and registered it cannot be changed. You can, however, petition the webmaster to change your screen name or Discussion Board name and he will do it on a "as time permits" basis.
“Life’s journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy ____…! What a ride!’” ~Hunter S. Thompson