Because of the urbanization of our society, we lost the close ties to our food supply. Food became neatly packaged, anonymous slabs of flesh in an antiseptic grocery store environment. It is pre-packaged, perfectly presented, and hygienic to our senses. All that you could possibly want in a future meal- clean, tidy, no muss, no fuss.
The same cannot be said for raising your own meat. First there is the raising of said meat which is an investment of time, money, and resources. All through the raising is the process of getting to know the animals while caring for them until they reach processing age/size. Then comes the inevitable day of processing where you have to cut short the lives you have been responsible for up to this point. And then, let's face it- processing your own meat is a nasty, messy, stinky job that takes a certain amount of fortitude to accomplish. If you were not raised around processing, it is a tough thing to take on later in life. A lot of people simply can't do it. Add into that the "pet" factor and you end up with folks who think of their birds more as extended family members than as potential food on the table. There is nothing wrong with this line of thought. It is in fact perfectly understandable...considering our society. Does it make sense? I don't think so, but then again, I eat all my culls.
I have a flock for meat, which is just birds that I maintain for 9 weeks until they become processing age. They get the best care they can get, but their life is destined to end at 9 weeks old. No names and no special care. And then I have a couple laying flocks that I keep for eggs and eye candy. These birds get names after their trial period of the first year. They get extra care and special attention. Essentially these birds are given a chance at having a long time with us. As long as they have a purpose then they have a life, and the purpose does not necessarily have to be as layers. (I have a nearly 5 y.o.GLW that barely lays, but she is a good broody, a good alpha hen and a gorgeous piece of living yard art, so she has a purpose.) As soon as birds stop serving a purpose then they are culled and eaten by our family. Then, they continued to be useful until the end. I have not the space or resources to keep useless animals aside from my 2 dogs. I wish that I could, but I cannot. Everyone living at our house must contribute in one way or another.