[Margaret Pilkington]

I think this is because the question is being answered by committed members of the forum.....those who come here on a daily basis.
If you asked some of those who have left there would be different(probably critical) answers.
A forum is fluid and ever evolving thing.....but no member is bigger than the forum......so if someone leaves there is going to be someone else who comes in and posts......and new members always bring something of themselves to the forum.
We have to hope that what they bring will be interesting, that they will be committed and that they will promote the forum among their friends, family and colleagues.