When it comes to professional racing, it's simply down to the gifted ability of that person. Some people can just naturally ride a bike quick and sometimes find it very hard to explain why.
A lot of their techniques also go against what is taught at the schools, and therein lies the problem - you simply cannot teach natural ability!
Obviously there are things that you can learn to ensure you're doing it the right way, or to improve your style and gain confidence, but these are all taught from someone who has their own view.
If it was as easy as being taught then, as Skidlids says, the podiums at races would simply be full with people who have the money to do the training and that's simply not the case.
The race schools do serve their purpose, and I'm not knocking them, but there's a lot to be said for racing the way you feel comfortable, and fastest, with rather than copying one particular riding style.
I doubt CSS teach you to back it into the corners like Rossi on any of their levels!