Well, as far as I saw on the list of things *not* to sell, this is not prohibited.

I have a RobotzInDisguise account, and it has a little over 140 hours of Mage Training Arena left on it. I will be selling this account for only $10.00, note that 200 hours costs $21.00, so, this is actually quite a deal, it's a little bit under what it should go for, based on their price range. Note also, 100 hours is $12.

Price: $10.00
Deal: You save ~$6.70