The potential damage that his can cause:

Hackers are always looking to benefit they self’s from stole not only the identity of his victim’s, but also acquired vital information from the victim. The most common in the video game industry is to gain credit card details or any other way of payment, like PayPal accounts. Keep in mind that some players link their credit card details to the account, so for there is easily to buy in-game content as:

Steam Account Transactions.

                     

            a)   Add-Ons.

      b)  In-game currency.

      c)  Vehicles, Weapons etc.

If the hacker gets access to this vital information, they can use these details to clear any current balance in these credit cards and the victim might not notice it.