John,
We usually make use of all the birds we shoot. This last place we had the tower shoot charges us to clean each bird.
He has a power feather plucker and does a really nice job on the birds.
There used to be wasted birds when you would hunt or shoot all day and then have to clean them when you got home. Now while we're cleaning up he does the birds for us and all we have to do when we get home is rinse and freeze them for later eating.
The birds that get away wounded are fox and cat food. The live birds that get away as you said are seeded into the countryside.