If you can't afford to wreck your car road racing or drag racing then you should'nt be doing it in the first place.
I agree 100% - but that's racing. If this is a HPDE, which it appears to be, then that behavior is unacceptable. I've only been to one HPDE so far, I intend to do more though, but I would not be happy with someone behaving like that. What's more the organizers of the event would have removed someone who behaved that way.
At the event I did go to, passing was only allowed at a time and point designated by the car in front through signalling. That seemed reasonable to me, at one time I was behind a driver who was far slower than me and I could have passed easily, they did not give me the signal and so I didn't pass. I followed them for 3 laps and was bitching to myself the whole time - but the rule was there for a reason.
If you want to drive that way, get a comp. licence and go and compete with other like-minded people. And, no, I can't afford it.