I know prior to the end of WWII I was buying a lot of Johnston Iron Horse or Briggs & Stratton 4-stoke 1 to 125hp power plants AS they waited for the Govt to get electricity to them like for milking & such.
Those I pulled apart & rebuilt to making my own one speed scooters.
Then when I moved into Banff National Park in Alberta in 1952 I was confronted with scooters made by Jawa, Lambaretta, to NSU Prima with all lost about spark plugs & such---so though I had two jobs like being an Instrument Man for the Trans Canada hwy & part owner of a sport shop basically for mountaineers or skiers I was asked to correct the errors on the mentioned scooters.
I note Yamaha had an 80cc with electric starter in 1980 & asked to ride it for I knew the makes mentioned were TERRIBLE in handeling. That Scooter by Yamaha was with all the corrections especially when going over railway lines which was the big test.
Then on came the fad of 49cc t-stroke scooters of now & one does not have to take a test, to no LP or such ONLY they lack any power especially if they have a hill to climb. Also the stab by Suzuki for the 400cc & later on Yamaha had a 400cc, but then Honda had an even later one.
So YES we know about scooters & the riders, but most are only 49cc & in a way are not in our world of more power or that of m/cing.
I tend to make a comment or two on this SCOOTER section for one has to remember I was making my own scooters right after WWII, to one even with a 3-speed 1934 Coventry-Eagle in a tube frame & leading link front end suspension. So YES some of us are interested but it is not the main fad for ALL of use, BUT you will find some have a m/c along with a scooter or two.
Remember all the others on the road are crazy & out to kill you.