Don’t know about CA, but in Nebraska (yes, we actually produce wine here) the start-up cost for a vineyard is between $10-20,000 per acre, depending on the grape varietal, the trellis system, and type of irrigation you choose.
Not yet - but it is something I am want to do with 2 acres of the 12 I own. So I’ve done research and attended conferences. At the moment, I don’t have the funds to invest.