Earning via boosting game accounts

I have been earning via boosting game accounts which is basically leveling them up to a certain level and then selling it to customers. However, the game seems to ban some of my accounts because of the violation of terms of sales whenever it detects me boosting them. Furthermore, I'll have to make sure I create as much randomness as possible in the process of making the account so that I cannot be detected boosting them. I would like to know if this is a haraam or a halaal way of earning as I put a lot of time and effort in boosting these accounts and I make sure they are sold to the customers with complete honesty and warranty of the account.