Here's the way I figure it. For all the fact of the matter that the process of brewing might take 6 hours, how much of that time is
actually spent brewing? I personally am on the internet for a vast majority of the time, and have been know to hop out on an errand during the conversion. I figure I have:
5 minutes filling various pots
15 minutes total mixing time over sparges
10 minutes whirlpooling during cooldown
45 minutes cleanup
5 minutes to sanitize and setup a siphon for kegging
So that's what, an hour and a half, rounded up? Really, the time spend brewing is generally highly exaggerated. You could easily get a stay-at-home job and earn money, even while brewing. Had I kids, it would be easy to see how for long stretches of time I could go and play with them, with a few short breaks here and there.
And then, consider that there'd be a 'cost' to doing whatever you'd be doing if you weren't homebrewing, either. A round of golf? Easily $25 with a cart. Go watch a movie? Last I checked, a ticket was $9.50 at the local cinema. That's just the physical cost, never mind the hypothetical 'labor' cost.
Now I'll admit that I've no economics studies under my belt (just regular old electrical engineering for me

), so I'd appreciate it if someone out there with it could tell me how all of my points stick.
But in the meantime, I'll not be counting the time, or at least most of it, I spend brewing as a "cost". Which means that at $20 or so per batch, I'm rather enjoying my saved money. Goodness knows that this poor college student is able to drink quite a bit more that I would be able to otherwise. And this is good stuff too!
And then there's the side hobbies like liquor making (no, not distilling. Go do some reading

). For something like kahlua or a fruit liquor I make, which would go for $20 or easily more, the production costs are well under $10, with almost no time involved. At the local HBC meeting, I've had more than one member subtly hint that I should look into commercial opportunities in that front, but I think that continuing my education is more important at this point.
Ok, I'll hop off the high horse here. I look forward to the eruditious discourse to follow.