I noticed the elitist comment and had to say that there have been and will continue to be the rule followers and rule dictators, they are not necessarily elitists, but "purists" in my opinion.
There are also a lot of people who want the very best, regardless of cost and can afford to do so. Whatever makes you happy.
I'm a practical person and I do use what I have on hand but enjoy the process of purchasing at my local quilt shops. The material is a better quality and I do mix with my less expensive JoAnn material and my hand-me-down material from the 70s and 80s...I prewash everything in my stash and some people will insist that these can't work together....they can and do. Experiment, find rules to break, and enjoy the process. Buy what you want and create your art.