The person who wants to discuss in-depth the characteristics and personality of the wine, how it dances across their tongue, reminding them of a funny thing that happened on the way to Napa. We all know "that guy." Don't be him.
That large format is pricier than 750ml. It didn't used to be that way. That and busloads of rude people showing up at the tasting room just when I'm getting into a good conversation with the staff.