You (assuming you are the author of the service) challenge people to find a flaw in your game theory.
Here it is. The world if full of trolls.
You have a 1000 dollar camera and I want to borrow it. I put up 1100 bucks and you put up your camera and 100 bucks.
If I'm a troll and enjoy making internet people suffer and happen to actually want a camera.
Then I can get yours and for an extra 100 bucks cause you to personally lose your camera and 100 bucks.
Sounds like the dream scheme for affluent trolls to leverage 100 bucks into 1100 of pain.