It is really just a matter of risk management. If you're running a large, active forum and are relying on that forum being highly available (for revenue or other reasons), then I would agree that running beta software would be an unwise move.
Many (most?) forums are smaller endeavors and if there's a problem, it's an inconvenience, but not a disaster. So for them, the risk of running the beta is minimal.
Each person's tolerance for risk is also different, as is their desire to take advantage of the new features offered in the beta.
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