So if I bought a half pig from you for 100 quid and it weighed 25kg? And then I bought another one for the same price but it only weighed 22kg? That's exactly why people get annoyed and start complaining on internet forums. Why don't you weigh each half and charge the correct price based on whatever it is per KG?
*blinks*
Because you are buying HALF A PIG of variable weight. If I buy a home made cake at a cake stall I am fully conscious that, not having come through the production line, it may vary in weight from the cake next to it. I don't sell it by 100gr, I sell the cake.
That is what happens when you buy a non production line item, it'll be different from it's neighbour.
The CORRECT price is the price for half a pig, it isn't sold per kilo.