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For example, even taking my investment in a bread machine into account, it is much cheaper and easier for me to make my own bread than to depend upon going to the store for a fresh supply.
I doubt that. Presumably you have to go to the store anyway for other food items, so it is certainly not easier to faff around weighing out flour, water and other ingredients (and trying to get the loaf out of the bread maker in one piece

), than walking up to a counter and picking up a loaf.
Cost difference is also likely to be pretty marginal, depending on how you value your free time and whether you enjoy making bread or find it a chore.
And it is usually way healthier.
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In what way is it healthier?
I can believe fls, as her experience agrees with mine.
I make about six 800g loaves a week, (two 1.5kg bags of flour, that last year were about 90p per bag, now about £1.30each, so £2.60 per week on flour). There is also about 120g of butter a week (50p). And the cost of the electricity. My breadmaker is 550W, peak usage, and 4/hours for a standard loaf, most of which is "resting", say an average usage of half that, so that makes about 6kWh/week electricity, at (say 14p/kWh) comes to 84p (say £1.00). Yeast and salt last for about a quarter (say £1/quarter each) (20p/week)
I have been rounding up all this time, so this comes to about £4/week for
6-800g loaves (of top-quality, fresh) bread.
Timewise:
I usally buy several weeks-worh of flour, in my normal shop, so that is marginal.
It takes me about 5mins to measure/weigh out the yeast, flour, water, salt and butter.
More to the point I can get
fresh bread, with a better texture ad flavour than one can buy in supermarkets (
almost as good as that available in the better bakeries IMHO).
The texture depends strongly on the flour tyope, and I am using stoneground/or filing that low-pressure, very strong breadflour.
I have used the breadmachine at this level of intensity since about 1999, when it was a christmas present, my parents having got one when their local bakery shut. It is a Panasonic machine, and they sem to be ones that people actually tend to use.
As to the way healthier:
http://www.food.gov.uk/news/newsarchive/2001/nov/saltinbread
Crusty white bread 545mg sodium/100g.
RMM Cl = 35.5
RMM Na = 23
=> this equates to about (0.545 x (23+35.5)/23) x8g/ salt per loaf.
I use 4g/loaf and my father uses less. I also know
what is in my bread.
EDIT:
Maybe not "way" healthier, but it actually tastes of bread...
Flavour and texture are the main reasons for my parents getting a breadmaker, and for me to use one too.