not really the same since the Porsche has demonstrably better performance.It is like asking why people buy a Porsche (or any luxury auto brand) while a KIA (or any cheap auto brand) does just the same.
The question here is why pay more for the same performance?
As an aside I was contacted by a company wanting to rent 6 BMW 4x4s, they had ordered some direct but the lead time was months.
I didn't have any BMWs but did have six KIA 4x4s that were brand new. They were very reluctant but I eventually talked them into it on the grounds it was only temporary.
Two weeks later they contacted me to say their people loved the KIAs, they would be keeping them, and they had cancelled the BMW order. All is not always as it appears!