Rediculous?

I think not.

You don't have to pay insurance,
You don't have to pay track rental.

If you get a full day of one-on-one instruction with Over 2 hours of driving time. NOT sitting but actaully track / course / driving time.

I would say it's definitely worth it.

ANyone who takes the course and had that much track time would easily improve ten fold over practicing for a few minutes here, few minutes there, and/or 10-15 runs at a local event similar to dday1 / 2.

But that's just my opinion and view. If I was looking to improve on drifting, I would take the course. Hell, I might take it anyway!