I overheard some of the staff saying that it was for ease of access, by which I mean, so that they don't have to scroll over your name to know who you are. Rules are rules really, if they get exceptions everyone will try to abuse the exceptions.
Hi Sumo, I have seen you in-game and you seem to be a great person, I hope you enjoy your stay.
Feel free to ask me or any of the staff members for help.