haha! that's a brilliant idea sir blanchy, why don't you start a scooter deal in Ireland? Or would all of them get ripped off or wrecked? I don't know if that works anywhere here, probably someplace but most places people would steal them just because they could.
There is a comment above that they are in lots of US cities including Baltimore which answers your question . . Dublin is cobblestones a lot so it may be a bumpy ride . Great idea though