A few of the nano scale brewery guys have come to club meetings to discuss their efforts. While turning your system into a money maker is a dream of most people, it doesn't always work out that way and there is a ton of work to it. I forgot the exact amounts but permits, business licenses and all the tax stuff really adds up (20k+?) as well as the time to navigate it all. 18 months is the number that sticks out but I may be a little off. Everybody was extremely nice and willing to share there experiences but also said how they kept their day jobs.
Foggy noggin - Brews on the weekends with his homebrew system and has to do many batches to keep up with demand (6/day?)
http://www.foggynogginbrewing.com/
192 gave us a tour of his brew shed. Has a slightly larger setup and does tastings out of his house.
http://192brewing.com/
Airways started out (and may still be on) a B3 system. I'd heard about this guy and was in the hood (literally) and stopped by. We chatted for over an hour until SWMBO threatened to leave me there.
http://airwaysbrewing.com/
If you're really interested in starting something up, talk to some people and see if they don't scare you out of it. And as someone already mentioned, you must scale up. I know it think it's attractive when I can make beers for $0.25/pint but then I remember I just did it with free labor. If I'm going to spend that much time making a batch, I want to yield as much as I can.
Oh and you'll need sankes because most bars don't take cornies.