Skimming some stuff related to writing my paper for PCA. Came across the following from a 1992 essay by Constance Penley, discussing TOS slash:
I already knew then... that this was an almost all-female fandom, and had also been able to get an idea of the extent of the production and the number of fans involved: there are probably not more than 500 active, core fans, although they publish a tremendous amount, which is disseminated beyond the core group through mail order and convention sales of th zines...
Compare this figure with something like, say
jim_and_bones which publicly has over a thousand members, of which (according to the published mod polls) some hundred or so actively participate.
Just think that's interesting, is all.