The only buyable race changes, if ever allowed at all, should be restricted to those which your class can already be from the start.
Edit: My reasoning: Effort in character( in this suggestion paying plat) is rewarded with an opportunity to change to a race that fits within the system. But effort out of the game (90% of the ways to get fame) rewards you with something that is extra for the game.
I would race change to erudite b/c I always wanted to be black
Cyzaine or someone mentioned donators receiving worn racial illusion ammo slots or something a while back in irc, this was a nice idea.
I would race change to erudite b/c I always wanted to be black