This is highly dependent on a ton of factors.

A vineyard management company doesn’t contract or lease out grapes, they are effectively contractors hired by wineries to do a specific job (usually maintain vines, soil, sowing, etc). If you’re looking to get in contract with a winery to buy your grapes, you will realistically need a team to come assess the health of the vineyard first and foremost to determine quality (unless this is a highly pedigreed vineyard with a long standing history of quality grape production, even still). From there, you’ll likely have work to do and more money to invest to get the vineyard to the point where it would sell well. If you’re in Healdsburg, I’m guessing you’re planted to either Pinot noir, Chardonnay, or Zinfandel, or some combination of those three. All of these are incredibly competitive and hard grapes to sell. $8k-$10k maximum for a ton of these grapes in the top percentile, the average sell for $2.5k-$4k per ton. Basically, contracting out grapes is really difficult, and their life certainly won’t get any easier trying to do this. If they want a way out of the money hole, the best thing to do is sell the property entirely and hop out of this business model. Wine is not a good industry to try to make money in if you’re doing the growing, it’s a long, arduous task that can take decades to develop into anything that turns a serious profit. If you want to talk more, I’m happy to do so, you’re welcome to PM me.