A lot of this has been just in the last month. Maybe he needs a tax write-off for 2012. Or maybe the prices are right as some wineries are probably getting a bit stressed financially by the recession and a few years of small grape harvests. With three years of short harvests the word is when the economy, and wine buying, picks up there will be a grape shortage in California. So those with the cash are buying up vineyard property.
I will guess ol' Bill's not done yet.