As @orange zeemeeuw said, I think it is definitely a younger person thing to do. Of course, some people don't bother but there's plenty that do and almost exclusively these are from Dutch friends and colleagues.
Could very well be a case of if someone celebrates Carnaval or not. Lived in both...
The Dutch love their caravans. If you ask the French who are the worst tourists, it isn't the Brits...
We have an app here for money transfers called Tikkie. I've been asked to contribute 40c before towards a 5 euro bill, the reputation is very fair.