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xoops.org isn't run on a shared hosting account, but on a dedicated server with large bandwidth quota's, so comparing xoops.org (+- 10.000 unique visitors/day) with your website won't help you here.
I'm with surpasshosting too, as will xoops.org when it moves to their new (dedicated) servers, and they know how XOOPS works. So if they say its your unique visitors, go into your cpanel, to web/ftp stats and use your favorite statistics application (I like awstats best) to see how many unique visitors you really have, as the XOOPS who is online block isn't a decent indication of that.
Herko