John,
I don't think your claim holds up. If I buy a timeshare with 10 other people, the timeshare is still private even if one of the 10 owners lets their friends stay there if they aren't using it on one of their weekends...
And I could be wrong, but i'm guessing the vast vast majority of raters don't just show up without contacting a club, slap their card down and say put me on the tee sheet. Someone still has to approve access to the course, even if it is unaccompanied.