I work with the beauty industry and I'm pretty sure that a lot of the misconceptions are based on trust. Cosmetologists pay an exorbitant amount of money for their educations and I know that natural hairstyles were not apart of my cost but there are some schools that will teach it to some extent or another. With that said, what a student pays for with regard to education they trust that they are getting the most current and best information available. This transfers to customers because when you pay someone to do your hair you trust that they are going to do the best and most up to date techniques. Through trust the industry has trumped you out of your money and honestly I don't believe it is always the locticians fault because they were trained a certain way that happens to be based in a popular misconception.
On the plus side, there are sites out there now that help to trump that misconception because when I went to beauty school and waxed my first set of dreads, this information was never found.