Rules for my Children who play Computer Games

You are not allowed to use real money to buy virtual goods in computer games.

Let us look at the Biblical basis for this rule:
Once when Jacob was cooking stew, Esau came in from the field, and he was exhausted. And Esau said to Jacob, “Let me eat some of that red stew, for I am exhausted!” (Therefore his name was called Edom) Jacob said, “Sell me your birthright now.” Esau said, “I am about to die; of what use is a birthright to me?” Jacob said, “Swear to me now.” So he swore to him and sold his birthright to Jacob. Then Jacob gave Esau bread and lentil stew, and he ate and drank and rose and went his way. Thus Esau despised his birthright. (Genesis 25:29-34 ESV)

Esau is the stupid fool who use his eternal heavenly wealth to buy perishable earthly food. It is the most expensive dish in the world. Neither should we use our real earthly money to buy virtual computer goods.

However, you can use virtual money to buy real goods.

It is none other than the Lord Jesus Himself who gave the Biblical basis for such instruction:
I tell you, use worldly wealth to gain friends for yourselves, so that when it is gone, you will be welcomed into eternal dwellings. (Luke 16:9 NIV)

We can use worldly wealth to change for eternal wealth. We can help the poor with our wealth, winning them to Christ. Earthly money has no eternal value. It is better to use it to "lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal (Matthew 6:20 KJV)." Likewise if your skill in the computer game is so good that you gain a lot of virtual wealth, and the game allow you to use it to buy real earthly objects, please do so. In fact, it would be very wise to do it.