I wish I had a microbrewery. No, I have a personal use set up. I make five gallons at a time. You, too, can make 5 gallons of delicious beer at a time for approximately $30 USD in materials with only a small $100 USD investment in supplies. However, there are ancillary costs*.
[rant]* you realize it's a bitch to actually scrub the bottles with brushes so you buy a $12 doohickey that turns your faucet into a high power, steaming hot pressure hose this is of course after you've already started blanching at just how expensive reusable glass bottles are so you figure fuck it I'll just buy more pop top beers I'll only have buy five half racks of beer and well at this point you're looking at your wallet going I just spent seventy fucking dollars on commercial beer so that I could get bottles for my homebrew oh my god what the fuck is the point of this then your first batch comes out and you know and after that you're like oh shit this is reusable but now I have to buy the caps and the doohickey to actually cap the beer** so it remains sanitary so I don't get sick RAGERAGERAGE but then you drink some beer and it's suddenly better because you're probably brewing something that tastes better than guinness and is at about 9% alcohol by volume and you have five fucking gallons of it
** this is after you've figured out that you can't use your rubber carpentry hammer to whack the caps back on the bottles because as it turns rubber really does beat glass in any way period and now there's glass and lagunitas everywhere [/rant]