[Mike174]

I agree that people stealing cars is probably far fetched, it only takes one broken car at the hands of an over enthusiastic driver and the whole thing is done. Another reason hosts would have to have participated/already run a proxy so they understand what’s required. 
As far as cars, I reckon most people will have 80’s cars of some sort (metros, 240z, rs500’s, Xr3i, sd1 rovers, 1275gt minis etc) kicking around that could be raced cheaply.