Videos as marketing tools
In principle they sound like a fairly good idea, at least for the student rather than the teacher. I have always found that videos are great as aids to memory but fairly poor as a primary tool for learning because it is way too easy to miss (visually) the small but important details that the teacher will cover in the lesson.
When I go to weekenders I am often in the situation of thinking, from the description of the class, that I would like to attend but that it conflicts with another class that I also want to attend. I turn up at the class I am most interested in and watch the demo at the beginning of the class and then make a decision as to whether I will stay or go to the alternative class. An online video of the content of a workshop would allow me to make a more informed decision about whether I want to spend time and resources travelling to the workshop. The overall effect of these online videos MAY be to put off people from attending and thereby decrease numbers of people attending.
In the particular case of the video used on this thread I feel I must give them the benefit of the doubt and say that I have seen some video encoders that have produced files where the sound and motion were out of sync. As for the other faults in their dancing I would suspect that if you knew enough to be able to spot these you probably know enough to not find anything of value in the lesson
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