Quoted from CrazyLevi:Not a smart thing to do. At all.
When you sell a game, you sell a game. That’s it. No conditions or issues that will potentially cause problems in the future.
To involve a FRIEND in an idea as a bad as this defies reason.
This situations has worked for me both as a buyer and reseller, and a seller and rebuyer. If you deal with other adults, there is no issue here.