The idea is to set up a game development futures market where gamers who want to see a particular game developed can pledge to have it developed or through market forces show the level of demand for a particular game. A prediction market or a futures market may be one way of achieving this.
Particularly we want a market to fund the development of open source cross platform games so that Linux users, Mac users, Windows users, can all benefit both from having the ability to play the game and from having the ability to access the source code so that they can develop an even better game based on the engine.
So we need a way to reward development of the engine itself, and a way to rate the quality of the code itself. We need a way to provide incentives for developers to write the code and a feedback mechanism so that the community can direct the development.