I personally think that the main driver is not cultural, but geographic and infra-structural differences.
-) water temperature
-) wind and wave strength, range
-) open water or not
-) beach surveillance

-) income, labour-spare time
-) access to beaches, lakes
-) fees, taxes
-) clubs, dealers

Even across Europe, conditions aren't constant. Are you refereing to cats or to boats in general?
Also this forum may not be representative, even for cat sailor in Europe.

Cheers,

Klaus