I see it this way: If I wanted the store-bought eggs I would not have gotten chickens. I see though where you are coming from: a commercially produced egg is commercially produced, no matter the price tag.I think it depends on which eggs a person would buy.
When I buy eggs in the store, I buy the cheapest ones. Chickens are only a money-saver for me if they produce eggs cheaper than the cheapest ones in the store.
I have a friend that buys organic free-range eggs when they don't have chickens of their own. As long as they can produce home-raised eggs cheaper than the organic free-range ones, they do save money by having their own chickens.
(Of course saving money is not the only reason to have chickens.)
The longer answer takes this off on a tangent though. There are many other reasons to have chickens (and other 'homesteading' endeavors) going.
And now you have me wanting to look at acreage again.....
On a small scale, the calculation does not even begin to level out for many years: I am sure we do not eat enough eggs to justify the $1000 I spent so far on the chickens - roughly.
The entertainment I get from their antics is not measurable in $$ though, nor is the forced structure to my day. I do expect a return on their output though, and not just the eggs.
