You guys do realize that that the NSX in 1996 could be bought for $60,000 and that's probably at the low end of the spectrum. If you add inflation to that that means $60,000 in 1996 would equal about $90,000 in 2016. So basically the guy is asking for the original price in 2016 when inflation is added.
The car does only have 9000 miles which basically makes the car brand new. The fact that its also a t-top also helps it price because there weren't too many NSX t-tops that were made.
So to the average person this may look insane but when you look at the fact $90,000 is probably pretty spot on. If this was a Ferrari or even a Porsche some might say they understand but because its an Acura people like to put it down. In reality as the rarity of the NSX goes up and as newer cleaner ones are harder to find - the price well only begin to rise.
This goes for the Acura Type-R and The S2000.