A customer of mine with possibly similar money in a Cosworth we did years ago sat in reception with me somewhat pissed off at doing another R&D box at £6K and i advised him that IMO, he should sit down with a Pen and paper and work out how many really meaningfull drives he had gotten out of his big power, and i mean drives that were memorable for the power alone and little else, as thats where his costs had gone, making it reliable with 500+bhp. Runs such as his 185+mph runs at Brunters etc etc.

He counted 7 memorable days. The rest it was largely off the road broken.
His car stood him at £30K.

I asked him if i was to offer him a drive of my car that would do 185mph today, would he accept that drive and be willing to pay £4285inc vat for it as thats what every momorable run had cost him in his?

Sadly, thats the reality of these cars and its a rich man who can just keep on going. He sold the car that weekend and bought a 911.

I havent seen him since. More fool me.