Fingers
I agree the cost and time issue is certainly a factor in determining what people brew. However, I think taste is more a determinant, at least in my case. I started with a kit and a kilo of dextrose. It made beer but was not what I'd hoped for and certainly didn't challenge the commercial brews out there for taste, aroma or appearance. I then moved to K&K+hops+Safale yeast. Better, but still missing that certain "something". I then tried maltodextrin, and some grains (chocolate and black malt), which gave me my first beer i was proud to hand over to my friends and say "here, try this - I think you'll like it".
Moving on to steeping crystal malts and other specialty grains and dropping the maltodextrin was a big improvement and only increased the time to make a brew by about 30 minutes and increased the cost by about $2 per brew. Next came liquid yeasts and another big improvement in flavour. Of course the next natural progression was to partial mashing and I am now making beer that I can confidently say is better than most Australian commercial (big name) beers. The extra cost is minimal, especially when you split your yeast starters. I estimate a good quality full strength beer will cost me $25-30 to make, which is less than half the price of a carton of similar standard commercial beer, with the exception that mine tastes better and I get to unleash the mad scientist/artist in myself every 3 weeks!
As for time, I have it down to a fine art: I arrive home from work and (after greeting the family, of course) immediately put my grains in the hot water (in my small partial mash esky), whack a blanket over it and leave it. This takes about 15 mins. I then spend the next 90 mins having dinner and putting the kids to bed. Ususally by 7.30 I head downstairs and lauter and sparge, which takes about 30 mins. Then I boil (1 hour 20 mins), chill (with ice - 20 mins), top up, aerate and pitch yeast (15 mins), then clean up (20 mins). So, all up it takes me about 3 hours of physical brewing time to make a batch (4hr 30mins if you include the mash time). I'm in bed by 10.30 happy with the thought that I've got a quality brew fermenting away through the night!
Cheers - Snow