Actually, thats not true. The Z06 is only cheap in terms of initial cost.
When you factor is how much Z06 tires cost compared to NSX tires, when you factor in depreciation/mile, the Z06 is not cheap.
I would rather buy a $90,000 NSX that I can sell for $70,000 3 years later then a $70,000 Z06 that I can only sell for $29,000 3 years later.
You are 100% correct in terms of value but that wasn't the point made. Performance to price is the issue and the Z06 does have no equal. It outperforms everything under $200K and then some--with an FR layout. The performance one gets for ~75K is extraordinary. All the other cars in it's performance class are even more expensive to operate and depreciate even faster.
I would also venture to guess the Z06 probably will have better overall reliability than both the F430 and Gallardo.
Of course I'd love to be able to mention a S/C NSX-R but that was never made available from Honda.