After the up-front payment, though, you essentially ride for free.. if you ignore things like tires, belts, and brakes.
The depreciation on batt cells will be big... assuming packs can't be rebuilt. But if packs can be upgraded at all, let alone as chemistries improve, then yes. Brake pads are nothing, really (particularly if regen is implemented, like Zero now). Tires? As long as you stay off the gummy race compounds, okay.
Still, I foresee some "valley of death" on highway recharge stations. There will be a brief period, between few remote charging points and very common recharging stations, where some of them will gouge. We have already seen a charge point or two that costs a flat fee, totally disproportionate to the actual electricity cost (pennies). That will end once there are enough places that you can pick and choose, but we ain't there yet of course.
Carlos