Sorry, but I just don't think changing the oil before every track event, five times a year, is needed. Nor flushing the brake fluid before every track event, five times a year. And I doubt that many dedicated trackers do that, either. But if you insist on that maintenance schedule - and that's certainly your privilege - then adjust your costs accordingly, and that can indeed drive your costs up dramatically. Your money, your decision.
As for the clutch, you are correct in describing the driver-related causes that make a clutch require more frequent replacement. However, those causes are pretty much the same whether you are accumulating your miles on the street or on the track, which means there's no difference due to track events. (However, you could reduce your costs by learning how to use a clutch properly.)
If you have any doubts about how good you are with a clutch, ask your mechanic to describe to you the condition of your clutch plates the next time you have transmission/clutch work performed on your car. Last year, Acura of Brookfield performed work on the transmissions/clutches of NSXs belonging to three different instructors at track events at about the same time. Two of the three transmissions showed signs of severe scorching on the clutch plates; one didn't. Scorching results from slipping the clutch excessively - on the street or on the track.
As for the clutch, you are correct in describing the driver-related causes that make a clutch require more frequent replacement. However, those causes are pretty much the same whether you are accumulating your miles on the street or on the track, which means there's no difference due to track events. (However, you could reduce your costs by learning how to use a clutch properly.)
If you have any doubts about how good you are with a clutch, ask your mechanic to describe to you the condition of your clutch plates the next time you have transmission/clutch work performed on your car. Last year, Acura of Brookfield performed work on the transmissions/clutches of NSXs belonging to three different instructors at track events at about the same time. Two of the three transmissions showed signs of severe scorching on the clutch plates; one didn't. Scorching results from slipping the clutch excessively - on the street or on the track.