I have taken bigger measures of medicine than what was poured into the glasses

Damn misers. Of course, they can't sell their booze - first they have to get a visitor drunk enough. That's the basics. If this family eventually fails after those 130 years, I won't be surprised.

hoped to see a multitude of local peasants stomping around bare foot...

No local peasants, but enslaved travelers in a secret underground, kidnapped a century or so ago and turned into underground slaves who stomp grapes by generations, eat stomped grapes, give birth in stomped grapes, and die in stomped grapes - that's why their booze has so many tones (including amniotic fluid, dead flash, cum, cigarette butts, etc). (Just a guess).