Aha, I looked it up, and Factol's Manifesto is what I was (mis-) remembering. In fact, in particular it has Factol Montgomery claim over 40,000 Sensates in Sigil, and presumably a few more scattered through the Gilded Hall and the rest of the planes. A lot of them anyhow. So yeah, a lot of the permanent residents, maybe as few as 1 in 10, if we go by 1.2 million total population and 40k Sensates exactly.
Of course, considerably lower here then is a possibility, given the feel Dhi wants, and honestly I think I'd probably do the same in her position. Or at least make most of the nominal faction members only people who hang out
with the faction rather than card carrying members themselves. That said, I'm going to take that figure as official for just a moment in service of a digression.
For starters, that's an absolutely terrifying
transient population. Sigil's going to look like a year-round intensely popular resort with that kind of imbalance, and it's even worse than it looks, as children and the elderly will be underrepresented in the transient population, so your primed aged workers will be disproportionately foreign transients. That is going to cause some very odd and interesting dynamics in terms of Sigilian economics.
This actually does explain why the Sensates are so massively wealthy, tho'. They have a stranglehold on the entertainment market in the most ungodly massive and popular vacation town in all of reality. Even with only 40,000 members which as MdG suggests, many of whom are probably not philosophically Sensates, but entertainers wanting in on the action and the like they're going to be swimming in sickening amounts of cash as everyone from all over the planes essentially comes and injects money into the Sensate pockets. Sigil must have some huge imports, too. Both on account of making up the tremendous import/export balance they'll otherwise have, and to make up for the fact that most of their labour is going to be transient.
Man, I may not be a specialist in planar demographics either, but now that I'm thinking about them I kind of want to be. This is fascinating
from a socioeconomic standpoint.
Anywho, stopping here so I don't end up boring everyone.
"Never trust a slaad," Ihaana learned the hard way, and later, "Never trust a snake."
Aww, but she's so friendly! She can't help it if she's evil.
And don't get me wrong, I agree with it being neat to having history together. Especially since all of the people who've been around longer than a few months probably have spent enough time around the Civic Festhall that they've at least had a few casual encounters. With Perrin it's easy, too! "Hey, aren't you that big snake who harasses the massage staff and has an abacus fetish?"