There are a variety of different kinds of lectures. For some, the attendees (in and out of the
room) are content to simply see the work of an incredible technician. Richard Turner comes to mind.
While Richard is happy to teach his material, it will take lots of time and practice (years in some
cases) to be able to perform it.
Other lectures are entertaining. David Williamson or Harry
Anderson's lectures were worth the price just for their entertainment value. Add in the material
taught and the lectures are an incredible deal.
Then there are the workers lectures. These are
the times when a real world performer shares the material with which he makes a living. Diamond
Jim's lecture is a worker. The lines are funny, the tricks clearly explained, and the performance
venues carefully outlined (e.g., this is a walk around trick when done this way, a table trick when
done this way).
If you are a real worker, or you aspire to be one, do yourself a favor. Buy
this lecture. You will never regret it and your audiences will love you for it.