What’s that got to do with buying or not buying Penfold wines?Plenty of people would rather buy from reputable sources, where you know the wine has been stored correctly.
Take into account retail stores, like BWS and Liquorland don't exactly store bottles well. Most are in direct light all the time, which isn't ideal and definitely not temperature controlled.
I'm sure for most wines it's OK, but if you're spending big $$$ you don't want to serve friends, or guests bad wine.