I used to crown my pigeons too, until I realised I was needlessly double handling them. After all, you've still got to cut the breast meat from the crowns anyway.
These days I just bring the haul home, peel the skin back from the breasts and cut them out and discard the carcass. takes a minute.
I guess crowning is good if you want to leave the carcasses in the field- can't see much point other than that.
I crown mine simply cause I sell what I can't give away, I let friends and family have theirs before I line my own pocket, and I believe that when you've crowned a pigeon you can't ha