It doesnt really matter what you do on a 'private road', unless its a racetrack, police will get involved if anything dangerous is happening.
There is a difference between buying a car thats been driven hard versus a car thats had the living shit thrashed out of it. So you think that changing any car into 1st at 50km/h and dropping the clutch is driving it hard? Wake up you yourself! It is not a rare sight at all, I am sure the ones that you've seen being thrashed around are the ones owned by your mate and immature, irresponsible people like him and yourself.
Sorry that you find my opinion on this topic patronising or critical, I am merly sharing my opinion. I am not asking to to accept it, everyone is young and stupid at some stage of their life. Its just a shame that people only get older and even more stupid!