I too much prefer the smaller wineries, most of the ones we have a lot of product from are in the 3,000 to 4,000 cases a year range. I also know that some wineries will try to hide their stuff from Parker, they don't want him wandering through asking to taste something they are not ready to taste yet, or don't like his reviews.
Personally, I don't usually go with the reviews, I prefer my own tastes. I honestly do not know the ratings Parker has given my favorite wines. I do know that sometimes it's a high number, and other times it's not. But no, I neither buy or base my thoughts on the scores, I much prefer to taste and make up my own mind. I've had some high seventy something rated wines I loved, and I've had some high 90 rated wines I was not thrilled with.