You can have a change if you send 50 BTC to a forum donation address. It is a right for Bitcointalk VIP members.
The forum is no longer accepting donations:
Because we are able to operate comfortably using advertising and fee revenue along with our BTC reserves, we no longer collect donations. If you want to help the forum, please make good posts, report rule-breaking posts, and invite friends. If you want to donate BTC, donate it to a charity, or maybe even to your fellow forum members.
Thank you to all past donators!
You have three things with your account: Username, Display name, and User ID. Username and display name can be changed but user id can not be changed.
From my observation, theymos only changes the display name and not the username or user ID