Yield is roughly 5 tons per acre, on mature vines (3-4 years old). The average price of Sonoma grapes is just under $2,000 per ton (higher in some areas, lower in others). Each acre should generate $10,000 + in revenue annually. After deducting the farming costs that leaves roughly $7,000 +/- $500 revenue.If you were to invest in a 10 acre farm the cost of the initial investment (excluding land price) would likely be $250,000. Add in the cost of land (at about $100,000 per acre) you are up to $1,250,000 initial investment.Assuming some mix of equity and loans 40/60 is typical you would be servicing about about $600,000 in debt over a 20 year period = $4500/month or $54,000/ year.Back to yields: If you plant a mix of grapes and can manage to yield $2,500 per acre you will generate about $125,000 per year in revenue.ssuming some mix of equity and loans 40/60 is typical you would be servicing about about $600,000 in debt over a 20 year period = $4500/month or $54,000/ year. Back to yields: If you plant a mix of grapes and can manage to yield $2,500 per acre you will generate about $125,000 per year in revenue.