Maybe American feed prices are drastically different, but a 50 lb bag of feed here is $22.00 and up depending on the season. We ran numbers and we'd have to charge 6.50 per lb to break even. EVEN. I am in awe when I see prices like that, I cannot even imagine.
$14.29/50lbs at my local farm store, which is roughly $13 Ca after the exchange rate - $9 per bag cheaper here. I don't know how much it might change with seasons.
Depending on what you count into the cost, I have seen some variation in the results. Also, I realize that there are a lot of average values involved in this kind of calculation, that may or may not pan out in reality.
But looking at the subsistence level operation I'm planning, the numbers are very encouraging.