I think on a "normal" trackday it's £10 per passenger and I can understand passengers having to pay as it gives basic insurance cover in case something does go wrong (also helmet hire?). Once a passenger has paid their cash they can also jump into any car - so potentially they can blag loads of rides
Have to admit I didn't hear about this in advance - if I had I'd have thought my driver would have taken the rally car out for a run (and I wouldn't mind a trip round the rallycross circuit either
). I think as a pre-season shakedown/test day it's a good idea, not sure it'd work so well during the season though. It might be worth pushing to the rally community too, there aren't many test venues about for rally cars and even fewer that are mixed surface.
Incidentally Dave - which airfield is that you're using?