The number of people on here seems to fluctuate and the proliferation of new forums and vintage airgun groups is bound to dilute the amount of time available. It doesn't bother me in the least. There's a core group of collectables members who can always be relied on to make interesting posts and the overall number hasn't changed massively over the years, even if the exact composition of the group is constantly changing. It's like any social group it seems to me. Sometimes friends are busy and take time away, sometimes they are very present and active. Either is fine with me.
I recently started posting more on another forum, but realised there were more unfriendly strangers there than I had thought, including one complete Bellend (). So I left and haven't been back since, which leaves me more time to spend elsewhere. Win win.