If its about Capitilization in your name, just log in with whatever capitilization you want. If you log in as tOmWaNkS you can, if you log in as TOMWANKS, you can, as long as you keep your name the same.
5K a letter? Havent heard that before, I would contact an admin about it, as they are also who do the namechanges.
And I believe its 100K for a namechange to any admin, with it being 100K more expensive with each namechange.
Though this all could be wrong, you should check with a Rednamed admin to get the info you need.