i don't think that this is possible. i think a week ago i gave a friend of mine 1k gold for regrading, house upgrade and stuff and he didnt get banned... but i did.
yesterday i bought 4k coins out of the auctionshouse scraping it into 100er pieces and gave 2 of them again to friends. i did speak to one of them and he got banned, couldnt speak with the other one, because he is at work but i think that the case by me
( issue of the "new" coins )