Hear what you're both saying but not sure the logic entirely holds up. I track my 991 GT3 regularly and sometimes come in with lap times sitting behind GTRs etc that have had some work done (tyres, brakes, suspension, aero). It doesn't phase me in the least. Nobody stops to look or listen to the GTR, whereas everyone stops to look and listen to the GT3 because its a track ready Porsche that looks and sounds amazing! At the end of the day that Porsche badge, model designation and driving experience are what you're paying for. I'd personally take the engine note of any NA flat six Porsche ever produced (air or water cooled) over a turbo charged four cylinder 718 (irrespective of lap times), where with your eyes closed the sound is comparable to a Subaru WRX. 4pot 718s and WRXs are great cars, but the visceral/noise experience is lacking. For me, it's the entire package of driving a car that matters, not simply lap times. From a financial perspective, future values of a GT4 / RS will also hold up far better than a 718 boxster with some work done. The whole question of "how much is the badge worth" is subjective and you only need to look at how the price of old Porsche 911s has appreciated to know that a crude economic rationalist view doesn't tend to apply when it comes to purchases of the heart!!!