I'll rephrase my original statement: it's no doubt that home brewed beer is less expensive on a per unit basis - I've done detailed economic analysis on brewing based on batch sizes and production rates.
My proposal was that in agregate the amount of money I spend on beer is not less - I just go through a lot more beer these days. There was a time where 5 gallons of beer in bottled case form could last many, many months. Now 5 gallons can go in a couple weeks (or even a single day sometimes) depending on who happens to be in the neighborhood.
I'm actually the opposite: I'm spending less and drinking less. Five gallons lasts me quite a while now and I get to see the different stages of the beer as it ages.