Now in USA and European cities the CO can sell cong A KH (own hall for years not sharing) and tell them to share with cong B and (maybe C)
Society make $100,000's. Cong A shares a hall with the KH of B (and maybe C)
Take a city with ten congs in 6 halls. They can make it nine congs in 4 halls, sell two.
Loadsamoney for Society/a few elders to spread about.
Elders can't say "it's our hall" so easily - after all "mother" really owns it now and the branch decides what is to be done with it.