Well, because a MUD isn't a single player game. Many people play MUDs/MMOs precisely because they want to play with other people. If you don't have many players, then an important and perhaps critical feature is missing from your MUD for these people.
The way to grow your MUD is to deliver both a quality product and quality service to people, day in and day out, year after year. Word of mouth is by far the biggest acquirer of new players, so if other people like it, they're going to bring their friends, and it grows from there.
--matt
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