Also, I think everyone in the group should have equal investment to the cause, whether it is monetary investment, time investment, supplies, whatever. In addition to what Sellersm said, everyone in the group needs to embody the same level of mental and physical commitment, or it might not hold up.
Now, who wants to buy some acreage, split it into parcels, and build some homes for likeminded individuals? I bet if somebody did this right, they could screen the buyers and "build" a group that could work, right?