Actually it is not a help question but probably not a bug too.
Just wanted to note, that search/spam crawlers make mostUsersEverOnline parameter quite useless. I believe they are using some multithreading process which causes multiple sessions created and you can get "Most users ever online was 200 " after a single spider visit.
Perhaps it is better to count only registered sessions or group by IP?
Gleb [originally posted on jforum.net by gst]