The involvement of an enthusiastic community with a reasonably intuitive toolset will stretch the life of a game well beyond what it would have been otherwise. The Neverwinter Nights community, for example, while not as vibrant as it was, is still releasing good-quality mods, some of which are better than the original "professional" game. Nathan Gibson mentioned Skyrim, and Steam has also released a Portal 2 toolset, with some very good results thus far.
All hail community modding, I say!
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