You can sell Virtual Assets outside Simcountry by creating an Asset Package.
The assets are taken out of your Simcountry Account and are stored in a Package. The assets are no longer available to you in Simcountry. Each created Package automatically receives a Secret Package Key that only you know.
You can now sell the Virtual Asset (ex. eBay). When you have sold the Asset, you give a link to Simcountry.com and the Secret Package Key to the buyer. The buyer follows the link to Simcountry.com and claims the asset. The Asset is automatically delivered to the account of the buyer.