not sure if i agree with the running costs of a Senna GTR, you need mechanics for that, and parts etc are pretty much the same.Problem with all the GT3 Mclaren cars (including 720 GT3X) is that you need mechanics at the track and in between sessions to support the car - and that the running costs by far execeed those of a Senna or Senna GTR … I have had a long talk about this with the race mechanic of my dealer who supports the customer teams and my dealers own race team for 24h races … he showed me the prices and changing intervals of the GT3 and they are 4-5x more expensive to run than a Senna GTR which basically will only need new pads from time to time, tires and very seldom new disks …
does not mean that a Senna GTR is a cheap car to have, but compared to a real GT3 it’s quiet cheap to maintain (of course much more to buy)
when we race with the GT3 car we change parts well before the break (hopefully) according to a lifing schedule. You cant have a 500 dollar part fail and ruin a 100k weekend of racing etc.
BUT for our track cars we change parts more or less when they fail or about to. not the end of the world if something breaks on a track day. so I think i can with 100% certainty say a GT3 is not 4-5x more expensive to run as a track day car than a Senna GTR. and that is just the cost of driving the car, never mind purhcase cost, financing cost on that 5% on 1.5mn pays for a few tyres etc....
the ONE cost that will be significantly higher with a race cars is your tyre budget. you wouldnt do more than 250km per set and that is stretchingit.
But you can drive comfortably to the track in whatever car you want, if something happens on the track, you just drive back home in that comfortable car
as to tracking road cars, the brake pads on a P1 was GBP11k and the disks/rotors GBP50k so not exactly cheap.
The Senna road car isnt exactly cheap to run, considering how fragile it is.
IF i had to have a road car as a track day car there really is only two alternatives, a GT3RS or a GT2RS. at least you know they can sort of handle a day a the track and you will most likely still be able to drive back home