[Fins]

Bridges and stuff sometimes pay for themselves in increased economic activity, as do highways etc. Not sure about SF, but in Chicago, say, on top of the state fee for the license stickers (far more reasonable than California's, of course, but still) there is a city fee for a city sticker that has to be applied to all vehicles registered in the city.

Practically speaking, though, as nice as it would be to get rid of cars, pollution, etc., it's not happening unless you can offer something better to the public, and scooters aren't it. And scooters, at least how I am reading news about them right, aren't exactly paying for any externalities either.