Interesting story.
But I guess even with a share, you still need to do some co-ordination (time booking) among the owners, correct?
However there is no hierarchy in that structure, so it's more about agreeing to ensure everyone can fly happily, rather than competing and hijacking, right?
In about 5 years I've only once had one clash with another member of the group. And he had the courtesy to call me to discuss. It turned out he wanted to fly early morning, and me in the afternoon so it wasn't even an issue.
At the club, it was about a member who had been there a lot longer than me, and was pally with the owner. He persuaded him to override my booking.