Why it is so important to teach "Presenting" in higher (business) education

From my experiences in business school, I can say that so many people - students and lecturers alike - don't know much about how to create and deliver effective and engaging presentations, that will make a difference and stay in students minds.
I think that the average retention rate from a lecture delivered with PowerPoint or other presentation software is too low. The only way retention is tested, is with a test or exam at the end of the course. But how much did the presentations of the topic contribute? How much did students take from the slides and print-outs they received? I think that too many information are lost just after the end of the presentation. I can only remember parts and messages of a few presentations and they were made by people who were able to tell compelling stories and did use examples and visuals instead of text-heavy slides.
I am not saying that self study and reading about a topic is not important, but in my opinion a lecture or presentation should at least add value to the learning experience and not be wasted time. By wasted time I mean that, students won't remember anything or too few information from a lecture presentation.

I state that it is essential that everybody should be taught how to present effectively.

Students look up to their lecturers and if they are confronted with bad and ineffective presentations and they don't even realize it, they are heading for big trouble down the road.
Especially business students will depend on good communication and presentation skills in their later profession. I suppose these skills are important for anybody pursuing a higher education degree. So many other students have a passion or finding they want and need to talk to a larger audience about. Why should anybody not to be able to be understood?
This is why presenting is so  important for anybody.

With Visu Presentations I want to provide this education. I am creating screencasts and video courses covering the presentation creation process I talked about last week. Furthermore I want to feature some presentation software tips and workflows. I will keep on blogging and tweeting my thoughts and tips I find through my research to help anybody to become a better presenter.