I am not judging, just really curious as to why some like these birds, not feeding the extra makes sense, do you have other reasons also.
1) Being able to sell pullet chicks at a premium.
2) Kids love to name the chicks, especially nice if they can be sure of the gender for the names
3) It's cool to understand the genetics behind the various sex-linked traits. I enjoy being able to predict the phenotype (appearance, production qualities, etc) of a cross, predicting the gender is an extra bonus. Did you know there is a cross where you can determine the gender before the chick is even hatched?