It's a small chance of getting banned, if you do it'll most likely be perm.
Anyhow, you shouldn't get caught if you solo it or do it with close/irl friends.
From past experience, I smuggled Dungeoneering items and stole other players' Dwarf Cannons (gaining me the 600K or so gold) and have yet to be banned on numerous accounts.
Edit: Nate got banned for self-vouching. As Tmoe said, just head over to the dispute forum to find out further information.