Superchargers aren't anyone's primary fuel source. Most everyone lives 50+ miles from the nearest one -- they're located along interstates, between cities rather than within cities, which avoids people using all the bays to charge up as part of their daily commute. Supercharging too often also reduces the lifespan of the battery moreso than a regular charge-up.
I believe you, but note that the Tesla website only says this:
> How often can I Supercharge, is it bad for my battery?
>
> Supercharging does not alter the new vehicle warranty.
> Customers are free to use the network as much as they like.
They do this to increase adoption, but it would probably still reduce the life of the battery. I doubt people would use their supercharger every day unless they happened to live next door to one. Their purpose of the supercharger network is to reduce the whole "distance-fear" that EVs have.
