Two comments:
1. The BCF format is way way way better than the other one. I read, occasionally, the other forum but rarely post. I think I've posted once, maybe?
2. I think the reduction in posts is partly because there is more information available by searching. I am starting my gauge restoration (i.e. take off the glass, clean and re-assemble; nothing major). I have found everything I need to know on BCF through a search (I use google). I am usually the young guy in the car club - and I'm not that young. It seems most folks wait until post-children to engage in expensive hobbies (time, money and space). I would be curious how the site traffic has varied over the years - vs. the posting count.
In a nutshell: thank you Basil.