That's the rub though, you're talking about a one-time payment.
That isn't a sustainable way to keep a company running. The amount of work that RAD puts into stuff like this, BINK, and their other tools if you wanted to do a OTP you'd be looking at something in the neighborhood of 50-60M.
Everyone uses their stuff in games since it's that good. You'd have to replace licensing costs not only for each game but each platform those games ship on.