I'm hardly a "professional" for that it would have to be my sole source of income. and I'm not there, not by a mile. But I appreciate the complement.

however I guess I can put together another trip.. it's pretty simple a week long trip with airfare, Car Rental, and hotel can be done for Just over $1000 on the cheap and $2000 if you want to go high class. (perhaps a bit more with the currently bad exchange rate) the way is in the numbers. if you can get 10 people willing to go for a week you have a lot more purchasing power. 5 rooms 3-4 rental cars.

one time however I had to attend a conference in Stuttgart and I just drove my rental car the 4 or so hours to get there. the Ring is a awesome place usually around 1:00 or 2:00 PM the factories wrap up their testing and the cars start packing the parking lot. Zondas, 911s, Buggattis.. and you can follow the one you want through the toll, the ring is a "toll oneway autobahn" it's a 14 euro "toll" to enter and you get to do a lap. (14 mile lap) that's all there is. no helmets required since it's a public unlimited road. Just pay the toll and GO. that's why as a visitor it's fine to take a rental car there.

and in Germany 70% of the rentals are manual transmissions too. so they don't look funny when you ask for a 335i with a stick as a rental.