I attempted to purchase a wowtoken on my temporarily disable alt account by transferring gold via the warbank.
There appears to be a limit to withdrawls on non-active accounts. However, this is not stated prior to taking out gold, only afterwards.
I withdrew 400k, only to receive 260k on my character and the gold is gone from the warbank. This is repeatable once you hit this cap as you can take out any amount, but only receive 1k in bags.
TLDR do not swop gold between active and non active accounts via the warbank. Withdrew 400k, limit was 260k, lost 140k gold to the ether.