Thank you!
Well, costs may differ because I live in Romania and it is a 1000 mile trip to get to Nurburgring... I have not done the math, but I would say 25 laps of Touristenfarhten + gas + accomodation + trip, would be around 1500 EURO (give or take).
But this trip is well worth it. Even if you may spend this money on mods, I think Nurburgring is a must for all auto enthusiasts so it really is money well spent...