Hi,
my suggestion is that you put some kind of information on your pages here (maybe below top Menu?), that will encourage people to register since non-members - members ration is like 4-7 x 1 all the time ..
The smaller the membership base the larger the ratio.
I have a forum with 60 members but the most ever online was 64.
It also has a lot to do with how high the time-out is set for the forum. If the time-out is set high it can show far more members online than actually are online.
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