I guess it depends on your priorities, but in terms of "potential customers relative to effort invested" it's likely to outrank most other features.
Which is rather the point. Yes, you can make the game unviable with raw telnet - that's not hard, but it solves nothing. The people who want to exploit things at the client-end will be unaffected, all you're doing is discouraging the people who don't want to download anything, or who prefer to use their regular mud client.
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