Not that expensive
I'm thinking of ED as a European vacation with a free (very nice) rental car. Tickets to Germany aren't that expensive. I only need to pay for airline tickets, lodging, food, and gas in Europe. I know I can do a 2 week trip there for about $2000 to $2500. Well worth the experience of sight seeing, driving the autobahn in a high horse power car, and driving the ring again. Much less than the price of an M.
I can't wait.