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I wonder how much of that is related to the psychology of the cost. That is, the more a product/service costs, the more the user is likely to assign value to that product/service that they otherwise would not note.

Psychological studies have been done that people who pay for something - anything at any price - always look more favourably on it than those who do not. One such study involved payment to see a film. Those who paid their own way ALWAYS had more favourable reviews of the film than those who were provided with a ticket for free.

Obviously, there is a limit to the psychology, but I wonder how much the feelings of a class' attendees can viably count toward evaluating the value of the workshop. Price is naturally where the willingness of the buyer to buy meets the willingness of the seller to sell, so the price of the workshop is beyond dispute in a free market context. But there are limits to what is rational, and I suspect there will be a significant percentage who will feel the workshop to be worth it merely because they paid a grand to be there. This "prestige" factor, after all, is one of the main components of a premium pricing plan.