Foul! - or is it Fowl?

Did an interesting calculation today as I knew the ready cooked chicken slices I have sometimes bought were overpriced. A pack of 4 slices of chicken breast, bought alone, was £3 and it contained 120g of chicken breast - 2.5p/g. This chicken, once cooked and dismembered (the breast will all be sliced up) yielded 772g of chicken and cost £5, - 0.64p/g. So, the pre-prepared option costs 4 times as much and doesn't taste as nice. Worth a thought?