Starting with the obvious, none of us are getting any younger and alas some of us are no longer on earth or are only just on the planet and have health concerns e.t.c. to occupy us.
For some it is no doubt energy sapping, seeing long periods of little results and this can be disheartening to the point of moving on.
Some of us have been threatened by family and/or others for participating in on line activities. This tends to push one to one of either end of the participation spectrum. In my own case the threats are made by those who wish to cover up, so that makes me more determined to find out why they are so desperate to resort to petty threats.
Probably for the majority it is a matter of available time. We live in a beautiful world, why spend more than a fleeting glance back to a disturbing past when there is so much else to do and enjoy. Unless of course you have lots of time up your sleeve in semi retirement, forgot to have kids and enjoy writing to all sorts of interesting people and posting whenever the mood directs
Of course Raz just posts on here to see what them crazy Kiwis are up to, way down there near Penguinland
