I recently visited a ubrew place in my old home town and had a chat to the guy there and he reckons that you really need about 250 000 people in the town itself for 1 ubrew place otherwise you probably wont do as well as youd like. This place is in a town of about 100 000 people and im sure he said that he only had 1500 clients, some brew every week(groups of guys) while others could be monthly or more(single guys).
Personally since I have just started brewing Id see my money better in Home Brew than at the cheapest $20-dearest $30 a carton from ubrew. Also you have to buy 6 cartons at a time($120-$180).
If the startup cost is $750 000 and he did 1 carton a week to every client at $25ctn(highly unlikely), it will take him 20 years to recover $750 000 without even paying for rent, overheads etc.
BIG GAMBLE
To be updated shortly....
HOMEBREW: IF I HAD TO EXPLAIN, YOU WOULDN'T UNDERSTAND