For anyone else who is unfamiliar with old Chinese measurement systems, Wikipedia specifies the catty at around 600g.
This means that the family received about 60kg of gold, or around US$3.6m at today's spot prices - a handsome reward for their valuable formula.
Even in the ancient proverbs, capitalism is the optimal way to allocate resources, and this efficient allocation benefits all. Someone should let Xi know about this. ;)