rogerd - 4:24 pm on Oct 25, 2004 (gmt 0)

Maybe your lurkers are PMing or e-mailing members who post when they need info? Seems unlikely, though.

What about searching? Quite a few forums require registration to search and that would certainly explain a lot of non-posting registered members.

There must be some reason for the relatively high percentage of non-posting members - personally, I'd never go to the trouble of registering at a forum and providing an email address unless there was some benefit to registration, i.e., some content or functionality that required membership to access.