We just started raising chickens this year. We raised 2 batches of 25 meaties on organic feed, our feed cost was right at $2.00 per lb of dressed bird. Sold a few for $4lb and a few others to friends for just more than the cost of feed.
However I can buy conventional feed for 1/2 the cost of organic so that would be about $1lb. 5lb bird x $1lb = $5, if I can sell for $10 thats in the money!
Tip, I have noticed that people buying whole birds focus more on the total price than per lb price. I think in many cases you could save on feed costs buy selling slightly smaller birds and sell it for the same price.