Like Dave says ......
I rarely use forums - & those that I do use it could be 2 yrs between visits - I would be put out to see I had to register again to use it .... Besides you can't remove just members - you remove data - datewise. So posts would also be deleted. It was voted some time ago by our members to keep old posts if possible so they could be referred to. - & that means keeping old members too.
Simple as that ... & what does it matter if users aren't active? No skin off anyone's nose ....
Well i believe there is pride in numbes and there is some sort of competition on recruits.
Nope .... remember that nearly all involved in this site are not only over 30 but well over 30 -- I don't think us of that age group think along lines like that .....
Simplicity is the ultimate sophistication. – Leonardo da Vinci