Actually, anyone planning a rally as they are presently configured has to approach it as a business. And, that's the dilemma for organizers; how to provide the expensive services attendees demand (like food, entertainment and well-organized rides) at an affordable and attractive fee, without losing money? The only way to do that is with a horde of well-trained but unpaid volunteers. That is very difficult to achieve and sustain year after year.
It seems the larger, more successful and enduring rallies are the ones, like SpyderFest, which are organized and sponsored by a company, like Pit Bull, who can stand to take a hit on the gate proceeds because of the invaluable PR, exposure and direct business it generates for them. Those organizers don't need the BRP subsidy for the event to make economic sense for them.
It is much more difficult for individuals (like Spyders in the Redwoods and the Red Rock Spyder Rally) to make it work financially, and almost impossible without having to raise fees considerably. They are also heavily dependent upon willing and able volunteers, most of whom don't know each other and don't already function as a team.
For club-sponsored rallies like NorCal, the volunteer team is already in place and they have the benefit of having ridden and socialized together for a long time so they are already pretty motivated and organized.