I'm guessin' they're more self-conscious then other locales. More press-aware. More worried about how others will weird out.
That, and the familiarity with a monster crime rate, and you have folks fearful of a house full of strangers. Havin' had them strangers in my hotel room, I found 'em all delightful. There's a great crew in SoCal. Just no one that wants to host, or pay for a hosting location.
If you find the space, I'll see someone that knows what to do is there. I'm wagerin' there'd be many there, too. By the third event, you'd have fly-ins, 'cause California is easy to visit, y'know?
dvnc