Perhaps it's perceived differently in different countries, but showing off just isn't cool.
There's a long shopping street in my city, away from the town centre, where all the smart bars, fashion stores and chain restaurants are. Expensive cars aren't uncommon there, but they're never parked up, you see them drive past in slow traffic, in a low gear or just with an obnoxiously load exhaust, then five minutes later once they've reached the roundabout at one end, you'll see them drive past the other way. Then another five minutes there they are heading back the other way again. I also live on the edge of the Peak District where there's some great (if often busy) driving roads. Do you ever see those GT3's, 488s or Aventadors out being enjoyed in the manner the engineers envisioned them being used? No. They're too busy being showed off on a busy shopping street. It's not just where i live, you see it everywhere.