Some of our most experienced wine entrepreneurs are among New Zealand's richest people.With so many tales of wineries struggling to survive in a tumultuous sea of oversupply and plunging profits, one would be forgiven for thinking everyone in the wine industry is on the verge of insolvency.Take a look at the country's rich list and the number of entries from wine entrepreneurs shows that though the category may have lost value, some individuals are still doing quite nicely.