My average cost for ingredients per 5 gallon batch is about $12. I will not include equipment in the cost per batch for the same reason I don't include the cost of my clubs in a round of golf, car insurance in the price of a can of tuna, or gas in the price of gas. Including time is ridiculous. If you include time in the cost then you must also do this for commercial beer (and everything else in your life ever). It's not $10 a six pack - it's closer to $14. Time, gas, insurance...these things add up.
Let's put some numbers together just for squirts and wiggles.
Fermenting bucket = $14
I put a tally mark on the side for every brew that goes through a bucket. So far I have 34 on one of my buckets. That's $0.41 per batch
I have a DIY e-BIAB pot I spent about $100 building. I easily have 150 brews through it. That's $0.67 per batch.
As far as time goes, I consider myself a very decent brewer so I'm going to pay myself $25/hr as a head brewer and $15/hr as an apprentice - the guy who cleans up after wards. The brew lasts about 3 hours set-up and tear down about 1. That's an additional $90 per batch in """""Labor""""".
My batch cost has now gone to a ridiculous $103 per batch. 5 gallons x 128 ounces per gallon / 12 ounces per bottle = 53.3 bottles per batch. $103 / 53.3 bottles = $1.93 per bottle or $11.59 per six pack.
We just compared kegs to bottles though. Let's do an apples to apples comparison. My local beer supply place (amazing shop in the Portland area if you ever find yourself here)
John's Marketplace, has sixtels of craft beer ranging from $92 - $134.
If you remove the ludicrous additions of time/labor and equipment, I do save about 80% over the commercial stuff. If you feel you need to include that, you at least break even if not a little savings.
At the end of the day I do not do this to save money. I do it because I love my beer and it's fun. Saving money is just a welcome byproduct.