Looking at the place I can see why the membership price is so high. That doesn't mean you'll never get to drive it though - just wait for a track day.
It'll obviously cost a hell of a lot more to rent this place out as a track day but with the giant size of the track your run groups can be a lot larger without being crowded and you can split the cost over a ton of people.
We can always hope for Nurburg-like open days but I'd be surprised (I'd also be in the car 10-min later). How do they manage the insurance liability in Germany?