voila le lien vers les infos de Unreal engine 3
http://www.devmaster.net/engines/engine_details.php?id=25
et sa sa peut peut-etre te donner une idée:
Royalty-Bearing License - For retail console & PC products
A non-refundable, non-recoupable license fee is due on execution of the agreement. The cost is US $350,000 for one of the available Unreal Engine 2 platforms, plus US $50,000 for each additional platform. A royalty of 3% is due on all revenue from the game, calculated on the wholesale price of the product minus (for console SKUs) console manufacturer fees. In the case of massive-multiplayer online games, the royalty is also due on the additional forms of revenue including subscriptions and advertisements.
Royalty-Free License - For any products
A non-refundable, non-recoupable license fee paid on execution of agreement: US $750,000 for one of the available platforms, plus US $100,000 for each additional platform. No royalty is due on any revenue from the product.