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I’ve never been on an organised wine tour but my family made a habit of swinging by a vinyard on the way back up north. The wine tasting comes with the beds (also, Zwiebelkuchen) and you get excellent prices on boxes because you’re cutting out the middle man. Kids get to taste different grape juices.
I suppose those kinds of offerings exist in all wine regions, an organised trip would then be visiting multiple of those places.
As someone from a region where we produce a little wine but don’t have it as a main industry, yes, they’re all over and admission price generally scales with the fame of the label.
Ones that don’t try to concentrate on international marketing can be quite reasonable.