That would be a reason to leave the site. This generates unessesary traffic, keeps my computer busy and generates even more unaccurate results. When I leave my computer, Renderosity counts me out after 30 minutes. The site you mentioned would keep polling and counting me as online until I close the browser.

Awfull.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.