Well I did wonder. Exchanged a few mails with Webmaster Steve who was fighting hard to keep the site going (it was stuttering and misfiring like it'd got flooded on the Northern Run!) and he ended up restarting the session table, which seemed to do the trick (guest users back down to 2!). I wondered if it might be something server-related that's not freeing up resources correctly after a guest leaves, but the guest count does fluctuate so I dunno.
Might be time to go for that fully-hosted and managed solution we keep muttering about...
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