> Coming from Europe I'm used to see that every vineyard makes their own wine.

This isn’t strictly true. Europe has négociants, who buy grapes from smaller growers to make wine from (to be fair, often alongside their own vineyard holdings).

> But then again, who cares for American wine (certainly not the Euros).

Huge fan of Old World wine here. With that said, the Americans are producing remarkable wines these days. For my palate, I enjoy Sonoma and Willamette Valley. Even tasted blind, top critics have preferred California to France — look up the Judgment of Paris!