This is price vs Laguna Seca performance plot created by @ilias.
As you can see, there is almost pure nonlinear function in how price explodes higher as you squeeze out last seconds from the Laguna Seca lap time.
Good example of "diminishing returns" law, which we see almost in any kind of product or service - the most specialist, most well made or very best performing product will sometimes cost multiples more than nearest rival, even if value difference is negligable.
For cars there are other strong factors that affect price - for example, Porsche 911 GT2 RS has very high collector appeal and you have to pay huge exclusivity premium on top of what you would expect to pay for the high performance.
Given enough market liquidity, there really is no such thing as "overpriced car". Prices are function of demand and availability.