Send 50 btc and buy the VIP membership, you can change your username by yourself.
You must be crazy
"The Pharmacist" didn't pay any 50 bitcoins to become "The Sceptical Chymist"
This is some kind of money scam. Some users change their nicknames for free, while others have to pay 50 bitcoins? Are you seriously kidding? Their request was answered because they had a convincing reason and their impact on the forum speak for itself.
Busy, I doubt Theymos would neglect a PM by a user That has really contributed to the forum and can be vested for by the public.
About the 50BTC is an option, and was created when Bitcoin was barely valuable and they haven't seen any reason to update it for reasons unknown.
If you plan on changing your Nickname Send a PM to Theymos and see how it goes