I think that's a very fair point. Being commercial may provide a greater motivation for keeping a game running, but as people have pointed out, that motivation, depending on the company, may extend only so far as they can make money running the world. It's also easy to start a world and proclaim that you have commercial ambitions. It's a lot harder to actually pull it off, and the disappointment of finding out how hard it is may cause upstart commercial virtual worlds to quickly fail.
--matt
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