I've long advocated for clubs to buy land away from the looney political urban fringe. So much of trials takes place on government or leased land. Risky! But for a club to do this, it becomes more expensive and requires working together in new ways, both of which I noted many trials riders aren't interested in.
The closer you get to populated areas, the more it will cost to buy enough land to insulate yourself from the frenzy. That takes a group effort like a limited membership land club. A large chunk will protect you from all but government run amok, and ours seems more inclined that way all the time, what with more motorcycle haters. For that you can go flick a Harley spode in his helmetless head and tell him to stick a potato in that open pipe!
As for the populated areas of California, I feel for you there. It's paradise lost.
My land is not a club effort, but as an individual I have done what I've advocated. I have 234 acres to ride on right our my back door, and 200 acres more elsewhere. This is in Oklahoma where people are still normal and friendly and speak English :-)
-CJ