yea, same over here it all depends on the track owners!! for one of the race meetings (obviously the organiser pays for it (plus it isnt really private)) it cost £3000 to hire the track for a day and ended up being an absolute disaster! due to some of the stuff going on around the circuit making it unsafe
10/15 € a day!!! is that private though?? because if it is that is very cheap !!!! because when we go publicaly it costs more than that! ... when i say private i mean not to the public, just to yourself and whoever you want to go on.
ciao