Yeah the V710's will wear and heat cycle out if you use them for every session. I've taken to using them only for time trials and the practice session before the time trial to set pressures and get a feel for the grip. For the rest of the sessions I use the NT-01's. They sit in-between a premium street tire and a slick in terms of grip and times. So yes, it is an economical decision, I like to do a lot of track days and can't afford $5K a year for tires. I think the V710's a slight grip advantage over the R6 which is why I like them for TT's. I also flip my slicks halfway through their life expectancy to get a little more out of them.
I have a friend with a Miata that runs A6's for the TT but basically even in that light car it is a one lap deal. Each lap time after the first gets slower where as with the V710 and the R6 each lap after the first gets faster as the temperature builds.
Be aware that if you auto-x club runs a street tire PAX then the NT-01 will not qualify as it is 100TW tire and the cut off is typically 140TW.
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