IMO that's a little different since many of them also buying the utility of appearances, which be flaunted at entirely legal speeds or even while parked.
In contrast, an expensive speedy car disguised as a cheap slow one would be much more suspicious.
Allow me to introduce you to sleepers which are somewhat expensive cars disguised as cheap pieces of shit. Most I've been in are absolutely terrifying but seem like lots of fun.
Based on how often I find myself watching laden work vans pass vehicles that can easily "do better" this, or something like it, is likely a common reason for purchase
I believe the Autobahn still carries the legal requirement to drive at a safe speed at all times. Pedal to the floor racing is not often safe speeds for a public road.
I mean, every person who purchases a car does so, at least implicitly. The very act of obtaining a driving license contains an (often explicit) promise to abide by the rules of the road.
You’re conflating two things and ignoring the thrust of the point: nobody buys a fast car to drive it slowly. Maybe some people do, the vast majority do not.
If promises about licenses meant a damn, we wouldn’t have speeding cameras.