I've noticed int he month I've been in Taswegia that there is a 'cross pollination' frame of mind with regard to breweries, wineries, cheeseries, choccy places and produce places.
They're all friendly and all happy to co-exist.
And they get TOP dollar for what they produce. Tassie is expensive (that's another day's gripe), but the fact that everyone leverages off everyone else means that the region gets the tourist dollar in a big way.
And I can imagine any wine region will have its share of wine yuppies, but much the same way as the drunk skanks wandering down racecourse road, ascot (in Brissie) are in the most yuppie suburb there is, but don't behave with any class - I can imagine the same thing will go down at booze up wineries in the Margaret river (or anywhere where that attitude is apparent).
Interestingly, my Mrs is now an avowed beer drinker (craft) rather than a wine drinker, and the thing that got her onto beer, other than my passion for craft and micro beer, was the wankiness of the wine-class, combined with places like Bittersuite, Tipplers, Archive (though got a bit rowdy before we left) and the like providing a safe environment to drink good beer (often with 3 or 4 kids in tow and having a meal (and children's menu or finger food) with it). Add in that she likes the "drink less, drink better" philosophy of micro/craft beer - she is sold.
So in this instance, the wineries were the ones who cost themselves a current and future customer, not the breweries.