If you do not wish to publish a ChoiceScript game via CoG, you can release it for free, or license the engine to release it commercially yourself:
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You can also publish your game for free, anywhere, and do not need permission to do so. However, should you intend or hope to earn revenue from your game by any means other than publishing via Choice of Games LLC, you must obtain a license from them authorizing you to use ChoiceScript for this purpose. Typically, this will cost 25% of all monies earned, including income from sales, advertising, sponsorship and/or donations in any way or form connected with the game itself (including, for example, advertising or donate buttons displayed on the same website as a 'free' game link).
Anything you write with ChoiceScript is owned by you unless CoG buys it and you sign a contract, but you have to pay them royalties if you earn money with a CS game not published by them (since it's CoG's engine).
http://choicescriptdev.wikia.com/wiki/P ... _your_game