Agree with gmon...tutorials are a sales tool first and foremost. Dan Worrall doesn't work for free, but none of his clients pass that cost on to us directly. You can watch hours of FabFilter tutorials for free any time you like.
I am, however, considering watching the seminar, as I am sure it will include aspects of the product that I've not explored. But it'll mean sitting through seven hours to glean one hour or less of new information. I would certainly not pay $79 to watch it.
EDIT: Never mind. Just checked the calendar and the 14th is a Wednesday. No way I can justify taking a weekday off work for this.