A lot of (particularly California) vineyards will just call their bar a "wine tasting" and charge by the glass. Couple years back I went to a similar setup for sake in Japan and it was awesome but there was almost no focus on even trying to understand the differences between the beverages and it was mostly a way to charge people by the flight.

But for anything that is actually a tasting that would attract "wine snobs" rather than soccer moms: There is generally a big focus on "doing it right". Partially because they are selling "the experience" but also because those vineyards/selections tend to be geared toward differentiable wines. So you aren't going to have ten syrahs. You'll have a merlot, a syrah, maybe a malbec, and so forth. And that lets people learn what kind of wine they actually like while ALSO knowing what bottles they want to buy from said vineyard/store/whatever.

And if you start getting shitfaced at those? Your ass gets thrown out. Because you aren't going to be in a position to buy a bottle and because you are "ruining the experience"... for the people who are probably going to buy two or three bottles each.