Could there please be a way to just sign up for all of them, automatically, and just keep track of the ones which are coming soon without having to post in every thread? Sort of a main list could be created, and people who don't want to be included every time can just pick the ones they want to be in separately. I still don't tend to feel anything during the mass sessions, but one of these times I could get lucky. It could happen any time now. But why not try them all, until then? I have to assume that they are still working.

Because people have to put a little effort by visiting the forum and signing up since it is a free thing we get.
That way CH is sure that people will visit, from the 130 people that posted for the mass session maybe 20-40 are actually active in this forum.

A "me, too" post in a Mass Session thread shouldn't count as forum participation.

I agree

28 of my posts are signing up for Mass Sessions. And I missed a lot of them, for various reasons. Why not let me sign up just once, for all of them? Why not avoid tens of thousands of "me, too" posts? Literally.