if you care for your main acc, do not do it.
theres no "sell/buy safe" thing anymore.
selling too much in one go gets you banned.
gold banks like
said are on the safer side. but since classic HC they are watching everything. mailboxes, p2p, AH, guild logs.
Throwaway accounts are now 1 month restricted from selling and chatting. i think warden got some kind of AI enhance too