Apparently they've been cracking down on the TCG scam lately..
But here's how I do it.
1. Get gold
2. log into my main in a second WoW
3. meet myself and trade the gold to my main account
4. (extra step, probably not necessary) put the gold in my personal guild bank that I use for my gliding alts.
5. Logout and delete the scam character
6. Make a character with same name and race as the scamming character
7. Go into the wow folder > WTF > account > (scam account)
8. Delete the scam characters folder.
9. Hope you dont get caught!!
10. If #9 goes well, have fun being rich