I make a few things at home rather than buying them commercially. I'm a smoker, and several years ago invested in an electric cigarette machine to 'roll' my own rather than spend $8-10 per pack, or about $90 for a carton. The machine was about $57 on amazon, and paid for itself within the first two months. Supplies cost me $38 for about 2 weeks' worth (about $10 less if I schlep out to the reservation). I also sew some of my own clothes, using remnants I get at walmart for about $4-8 for 2-4 yards, or waiting for big sales. If something around here needs repairing, I'll always look into doing it myself before paying to have someone else do it. House hasn't fallen down yet.
For brewing, I consider my equipment 'paid off' since I haven't bought anything new in about three years (been brewing for 9). Like many of us, a lot of my equipment (ferment fridge, brewstand, most of my kegs) are someone else's castoffs, except for the brewstand which was a gift. So my only costs there, barring small replacement parts on occasion, is ingredients. I re-use yeast, buy grain and hops in bulk. The last time I did the math, a 5 gallon batch costs me less than $30 without factoring in my time, since it's a hobby and I don't get paid for hobbies. Some batches cost more, of course, depending on what I'm brewing. Around here a pint of craft at a bar/restaurant/brewpub can cost as much as $9. Even domestic is at least $6. Not including my labor (which again I consider free since I love brewing), a pint costs me about $.50.
So, although the initial layout for equipment (as of this year I've spent about $1200 over nine years) is pricey, I think it's safe to say that I DO save money brewing my own. I would definitely drink a lot less if I had to buy beer commercially, but even factoring that in I think I still save money.