Good range of views here. This is a complex issue with so many variables.
Liam, I agree with you that paid workshops must go the extra mile. Presenters need to raise the bar in terms of value. Just like any workshop, any information product, any membership, you have to deliver exceptional content.
However, I don't agree that "95% of presenters are rehashing common knowledge." And how do you decide what's rehashing, anyway? The value of the content is in the eyes of the beholder. For instance, a solopreneur who has been in business for six months might find a basic workshop on, say, finding your USP, very helpful. Paid or not, she would likely get a lot out of the workshop. A 20-year marketing veteran? Not so much. From someone with a Master's in Education and years teaching adult learners, for me, it still just boils down to making the content relevant for your audience.
Bob and I teach blogging and marketing with eletters workshops (both free) and we have gotten very favorable responses in terms of information and new skills people take away. We do have people from these classes approach us later to help them with their marketing. They have also signed up for our marketing e-tips, which allows us to stay in regular (weekly) contact with them. So we see great benefit in hosting workshops, even though some of them they are free.
On the paid issue, we are offering our first workshop with a fee: WordPress Simplified. It's an intensive, three-hour lab experience where all attendees will be able to go online and walk through each component of the WordPress dashboard, play with widgets and plugins, and learn other new skills. Each attendee will walk away with a far better understanding of managing their WordPress blog or website. Better yet, they get to practice the steps, which is far more effective than watching a video, listening to a podcast, or reading a book. And to hire someone to figure this all out for them would costs at least four times the amount of the class fee.
There are many ways to look at this issue because we all have different needs and goals. Thanks, Lynn, for getting this interesting discussion going.