Agreed.
My take on things is:
0 - 20 posts - likely to be bullshit if posting a rumour
20 - 500 posts - keep a close eye on whether posts are worth reading
500 - 2000 posts - time to form an opinion on
2000 - 8000 posts - unlikely to post complete rubbish
8000 - 15000 posts - likely to be in...