The Great White North, where we get taxed out the wazoo
There was one in Ontario Canada last fall and the 2 day option with lunches and a 2 night stall was $945 CAN with taxes in. Lessons were about 1 3/4 hours and worth every penny (bucket list). I think I figured it out at $8 a minute. :-)
There's one in KY that is 3 days that is $1000 if memory serves. Lunch is included, and I think at one point there was no +1, even a groom had to pay an auditing fee, but I believe that was changed last time I got the flyer.
I imagine GM charges the same flat fee for a day rate, and the clinic host charges what they need to in order to make the money back. Places where they have a bigger draw, or more students, can probably charge a little less, but I imagine there is a limit on the size of the groups.
The time I audited I went all 3 days and it was fantastic. I am dying to ride in one of these clinics, but so far the KY one has not worked out with my work schedule and other commitments. If you have a chance to go, even just to watch, it is well worth the time and $.
Destiny is not a matter of chance, it is a matter of choice; it is not a thing to be waited for, it is a thing to be achieved. - William Jennings Bryan