It wasn't 500 registered users logged in. It will have been 500 different connections to the database behind the site. When you look at who is online at anytime most of the users show as "guests" these are either people who haven't logged in or are automatic search spiders from the likes of Google etc.
There's a possibly that R. was doing some plumbing that night and that could also have exaggerated the records in the database.
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