So after being banned several months back for seemingly no reason at all (Gold selling was the reason given), I decided to jump back in for the hell of it, this happens to be the third time i've come back so far this year. I'm basically an addict at this point.
With this in mind, I decided to start anew on my banned account simply using a new license, seeing as the email I used for the banned account was my main one, and I decided to have no involvement with anything against the terms of service on the account. After creating a new license and attaching it to my old banned account, I logged in with my free month and got to playing, when something hit me... I still had all my account wide things from my banned account? Surely something wasn't in order there, the account was banned and the new license I had only had a level 1 with nothing on it; except for all my old mounts, looms, achievements, pets, and more.
To say the least, I was stunned by this, and came to a realization, if this works consistently, (I have only tested this once, be in mind). That means that you could duplicate these account bound items on to new licenses, even if the main license is banned.
In simpler terms, if I have an old account that got accidently banned in wrath with a black qiraji mount, and I want that qiraji back, I can simply make a new license on that banned account, the mount will copy over, then sell the account with a level 1 and a black qiraji for several thousand dollars. WHICH MEANS one could simply buy battle.net attached banned licenses on the low low and resell them with whatever carries over after attaching a battle chest.
My proof of this concept is as follows, I have been playing off my battlechest free month (As in the picture below), and have a level 100 along with a few higher level characters. WoW3 is the new active account with my new characters I leveled on it, while WoW2 is a banned license from around january of this year with a molten core mount, and around 4k achievement points.
Duping - Album on Imgur
I need more input to say whether or not this is a consistent thing (works for all banned licenses) however it worked for me, your mileage may vary. Good luck.