Growing-Grapes.org

Not really. There is excess supply in the world.
If you can make and market your own wine, or you are so good at growing the really good stuff you can get a premium price, you can make money.

There is great money to be made from grapes. Well perhaps prior to the economy crashing. I have a friend whose family grows grapes for Gallo winery. The man is making a stinkin butt load of cash. It is a business as any other in that you have overhead and must have a buyer. You must understand the set of growing conditions that produce quality Vitis vinifera.
Money to be made? Yes.
Fierce competition? Likely so.

http://wineserver.ucdavis.edu/
http://extension.ucdavis.edu/unit/winemaking/

Not really, unless you have the right "terroire" to produce top class grapes.

Even then the money is in the end product, the wine, rather than the grapes.