well I'm none of those (and I had every thing from a skate board to quad bikes when I was a kid, still do have most of them) there are loads of places to use them but not on the road or footpaths, it's bad enough that every old fart or dole scrounger faking a bad back is all over the road / footpaths on those invalidity scooters let alone these things.
If you did not bother to look them up before parting with your cash you cant then moan about them.