Well they are - in the sense that the practical value is very limited and there are better alternatives in every regard (even in the ideal scenario where you live in a place with excellent riding conditions and limited parking which benefits a bike - a scooter is going to give you easier riding since it's automatic, less maintenance, more storage capacity and will be plenty fast for commuting if you get 300/600cc ones).
My bike is a toy - it's just a dangerous one.