This is the most expensive item ever sold. In shooting games like counter strike people buy guns/knifes that have skins for hundreds/thousands of dollars. There was a skin for a gun sold in counter strike for $61,000. I just sold an item on steam marketplace for a few hundred that I didn't even know I had a few weeks ago.
"In real life, you can buy stars and own parts of asteroids, at least if you’ve got enough cash. In the game Entropia, you can own a whole planet. A company named SEE Virtual Worlds showed that when they negotiated a deal to buy the planet Calypso from MindArk Studios. In the end, they got it. The final price? Over 6 MILLION dollars."