Same over here...
I'm quite happy with the power of a 50cc scoot upgraded to 85cc, and this is something we can get away with for most of the time...
But when we want to drive a 125cc, we have to get a full motorcycle license, which costs a lot of money, time and frustration (3 exams at least, even when you already have a license for car) And if one goes trough all the trouble for a full license, one could as well buy a larger bike, since you don't want to leave the city with a 125cc in our traffic...
So strictly 50cc scoots, what are the best options quality wise ?