Our group of 6 has 1who works a normal week, 1 works offshore - weeks can't fly, then weeks free. 2 retired, and available any time. 2 "retired" but work as if they weren't. 5 fly very little at present. I get a very good bargain.
One advantage of a group is others to help if you have a problem - e.g. our exhaust cracked after landing on hilltop strip with the only hangar occupied by the strip-owner's aircraft.
We have no currency rule - but our only low hour member is very cautious about flying solo.
We used to have a 10 hour per month rule - then it became priority to others after you've flown 10 hours in the month. And NO booking for the Strut Fly-in - an agreed person flies it there and back, and ever member attending can fly it.
As well as personalities, the time free to fly also matters.
My personality would NOT fit with an equal share owner who claimed to control the group - and neither would the guys I share with.