The major problem to opening a pool room , in the 60s and 70s was that no bank would loan a quarter to you for a pool room, unless you already had double the collateral.
You could go in partners with a vending company owned by the mob if you didn't mind doing time in prison somewhere down the road, to prove your loyalty.
By the time I had enough money to open one on my own in the mid eighties, it was the last thing I wanted to do with my hard earned money.
I still enjoyed playing.
Owning a pool room destroys that for most people.