when i sold most of our first litter for finishing, my friend was shocked cos they were rare and thought all would be kept for breeding. when i offered our piglet on a "buy-a-piglet" scheme, some thought they were being sponsored for life, like as in an animal shelter.
you have to repeatedly explain that by eating rare breed meat, u are promoting the breeding of more litters, and therefore helping to prevent extinction, or poor gene pool. and u still need to breed only from the best, and eat the rest.