In Geneva, there is whole range of shops no locals are buying anything, ever. I mean no local swiss bankers, Procter&Gamble global managers, UN high bureaucrats, nobody. Its just that ridiculous.

But every summer (apart from recent covid ones), whole planes come from Arabian gulf. Planes full of ferraris and lambos, so you suddenly see (and hear) a lot of arab plated cars in central europe. These people shop as you describe - come to ie Versace or Piguet shop because its just by the lake, spend ridiculous amount and go to next shop.

Basically these few weeks enable those shops to survive for rest of the year since rentals are crazy.