Motorsport = expensive...
Define your interpretation of expensive..

I believe it's reasonably priced.. My wife's expenses on her 3 horses a week, that i reckon is fucking extortion!!!!!

As Karl said, stay out of the trees, maintain your car, have mechanical empathy & it's reasonable (again define your definition of reasonable)

Entry fee to a state round of the rally championship is up around the $800, that's before you through any tyres, fuel, go faster bits at the car, get to the event, look after your service crew at the event....

It's like going to the casino though, don't race what your not prepared to through away.!!