safely selling / buying gold from other players..how?

[hexengon]

I know if you want to sell gold to another person for real money, you dont do it through AH or mail as blizzard will scan every mail you send out, so the best way is to meet the person ingame transfer, is this still risky? like, if you have 1 account with lvl 1's on multiple servers just transfering gold back and forth, will they notice,?? anyone ever get banned from selling gold? if so, how do other people avoid this..how do they keep selling gold? or does blizzard only go after farming gold and botting and powerlvling sharing accnt etc..