Sorry..... Have to disagree. Flour to bread is a terrible comparison to pasteurized kit juice to fresh crushed premium grapes! I can give you the best chef in the world.... But if has has to prepare a meal with tough meat vs. a filet. It will be different! Bottom line I believe it is not about quality. That is a given! It is more about time and money... People will give all the reasons and excuses they want. It is still about time and money.
Sam
Sam, for me it does have to do with time, money and many other things. But it is not just that I don't have the time or don't have the money. It is more I don't see a justifiable differential value of making wine from grapes at this stage in my life given the time, money, space, mess, fruit flies, equipment required, seasonality, limited selection of grape varieties, etc. when I can make wine from juice buckets and kits that is very, very drinkable and that friends, neighbors, relatives and I perceive is as good or better than commercial wines costing up to $25. This is not to say that these conditions and preferences exist for everyone.
Secondly, I believe that GaDawg's analogy in making bread does have merit. If you make pasta sauce, do you start with fresh tomatoes, skin them, seed them and puree them? I don't. I have done so when I had a garden and the sauce was wonderful. I now find that Contadina, Hunt's and a number of other canners do a very good job and the differential benefit of processing my own tomatoes is not a good value proposition for me. If someone finds it is worth it to process their own tomatoes, more power to them.
Further, I respectfully disagree with your analogy of a "the best chef in the world." If he were truly the best chef in the World or even just a talented chef, he could take a tough piece of meat and make it taste like a filet. This is not unlike some of the "tweaking" I do with juice buckets and kits.
Lastly, if you think quality is a "given" for wine from fresh grapes, you need to taste some of the homemade wines I have had, made from fresh grapes. I think the rule is, There is no rule and just as one can mess up a fine filet, another can make excellent wine from a juice bucket or kit.