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You can earn good money, but even the good local pickers tended to be the type that would piss most of it away of an evening. Oh, and all this is based on 25+ yo knowledge. Most of the vineyards got paid out to shut down and the wine grape production is now done on a massive scale by SouthCorp (I think). They removed the need to manual labour and smaller independent growers and can better control crop quality yada yada. A few smaller growers still operate but it's more boutique and hobbyist level stuff. The big guys that ship all that Aussie piss to Tesco are doing it on a much larger scale nowadays.
Yeah, I never really understood why it's such a common job for backpackers as in mainland Europe it's seen as typical exploitation work, hence why besides backpackers you only ever see illegal immigrants working there. Maybe it's different in places like Australia where this seems so common, I don't know.