Including modding tools, or easy access to modding, will always be good business sense. There are people, like myself, who value paying 60 dollars for a game with an extended lifespan via modding over 60 dollars for a "play it once and you're done" experience. The former is a no-brainer, and the latter is something I need to weigh in whether or not I really need the game (and more often than not, I don't).
I am FAR more inclined to recommend moddable games like Dungeons of Dredmor to friends than if it didn't have the ability to easily mod it.
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