Stolen bikes

Amsterdam, thieves is not much of a problem (it does exist though), as everyone and their mums have bicycles, so who are the thieves going to sell it to?

Theft is a MASSIVE problem in Holland. It's no different from here, where there's a market, there are thieves. Why do you think most people ride the crappiest rustiest most wobbly-wheeled bike they can get? I lived there for 3 years and the only reason my bike never got stolen is because it was an old 80s Batavus racer with ugly flat bars, i.e., something no junkie could sell quickly for €20 because nobody wants one. But typical Dutch bikes go missing all the time. Nearly every Dutchie I knew had had a bike stolen at least once in their lifetime.

People with "good" bikes pay to lock them up at the "bewaakte fietsenstalling" (guarded bike parking). It's something like 50 cents a day, or €60 a year for people who ride to the station and lock them up every day. It's a good system but requires the underlying infrastructure and space to put them. Seeing how hard it is for the Boris Bikes in NIMBY London to get space for the docks, I don't see protected and paid bike parking happening in the near future.