Cofty,
I think your comments about their achieiving "cult" status at that time are right on. My grandfather got involved in 1910, from what I know of him I firmly believe he was attracted to the pyramid measuring thing, but before his death he made documented comments that he was having a hard time with what was going on. He happened to be close friends with one of Rubberfarts henchmen, which I firmly believe accounted for him being among the 25% that remained after the 1925 debacle. But as the numbers Leolaia posted shows, the numbers started to go up shortly after, and I suppose it would be easy, especially if you had a powerful friend, to just go on with it. In my grandfather's case, it appears that it was about 10-15 years before the changes started bothering him.