Cinderella’s Royal Table is located on what was originally planned as WDW’s Club 33; I’m not sure why it became a public restaurant as opposed to a private one. I’ve been a guest to Club 33 at Tokyo Disneyland several times and a large percentage of the memberships are corporate owned. Disney staff would meet us at the park gate and guide us to the restaurant.
Having it as a restaurant probably makes more money than having members pay 15-20k. They pump a lot of people through that terribly overpriced restaurant in the castle. Also, I've been to Club 33 once as a invited guest, and while it was a very cool and magical experience, I wouldn't spend my money that way. That's just me. Now if this is some sort of club at each park that you're buying into with some unique perks then maybe...