@Darkmint13 : Pride, stuborness and a complete lack of decent education theory??? There are to many "educators" who teach things there way, and refuse to accept or acknowledge any other methods.
Plus understanding the different ways people learn, and how to recognize and compensate for learning disabilities, as part of the education system is really much more modern then it should be.
That and experts in a field are often the worst people to try and teach the basics of the field as they can not see how someone has problems with the "trival" parts.
When I was at university there was 1 guy offering tutoring sessions for the intro math courses every science major took (he was a high school teacher who taught the AP math course covering the same material). He used different but perfectly valid methods then some proffs, and I would always hear stories (but never got direct confirmation) about proffs marking his methods wrong because it was not their preferred method. There were also proffs who it was a waste to buy the textbook if you could take decent notes since the methods they covered in class where the only one that the proff would mark right and the book offered no other benefit in the course.