It is probably a matter of dealing with the work overhead. Bronzes either spoil or turn shithead too easily. Most people buy them as experiments or abyuse fodder anyway. Weeding out the bottom tier makes feed for the predators as well.
But having overly strict "grading standard" can make it confusing. Eventually every breeders and company will have their own grading like hotel or hospital's "First class".
Ideally it should be like meat's grading, an industry standard that average buyers can feel assured they are getting what they paid for.
He could have been using the market standard. Checking for average ability to learn and such. Maybe his grade was just overall potential of each Yukkuri before get its test done by official agency. Anyone know when they saw a shithead or stupid one that will never made it to silvers, so why bother?
Salem said: But having overly strict "grading standard" can make it confusing. Eventually every breeders and company will have their own grading like hotel or hospital's "First class".
the standards are more or less established by the story's canon and nothing else. Some stories having platinum gradings as top and some have gold as top. It's pretty commonly accepted though that bronze are little better than strays.
Having a bronze badge not be worth having does not make sense to me. It does make sense if a given yukkuri needed to pass the bronze badge test to be admitted to the silver badge testing and so on.
[Chieftain]
A scumbag Dosu stole her herd and then Oniisan took her in.
Now acts as the village chief, of sorts.*Above: P = Platinum, G = Gold, S = Silver, B = Bronze.[Domestic Yukkuri: Village]
Only Platinum, Gold, or Silver ranks are kept. Bronze-ranked ones are disposed of either by being made into exterminator feed, or by being used as abyuse fodder.[Exterminator Yukkuri]
Thoroughly trained and will only eat scumbags and harmful types.[Koro]
Problem child who exterminates the house-yu.[Compost]
Used for disposal of scumbags and harmful yukkuri, which are either turned into fertilizer or fed to the exterminators.[Boss]
Leader of the Exterminator Yukkuri.
Tasked with finding the hiding places of harmful yukkuri.Chen
Unique bodied Chen
Can produce fire (about as much as a lighter).Breeder oniisan
Breeds Yukkuri out in the rural areas.