I don't think it really matters what the membership number is as long as the forums running along smoothly and friendly
On my own forum ,
I spring clean every now and again and have recently deleted at least 10 duplicates, and i now delete people i have banned permanently, The Staff are also warned to keep away from the broom There is alot that goes on behind the scenes of these forums. as long as people keep joining and have a reason to come back thats all that matters.
I do try and contact the duplicate people to see if there is a problem before i delete. I'm sure Roger and Dave have everything under control and you need not worry re in accurate numbers