Economy:
Electric bicycles are incredibly frugal compared with motorbikes and cars and only cost around 5-10p worth of electricity to fully recharge a flat battery!
They are treated just like ordinary bicycles for legislative purposes so there’s no need to worry about Log Books, MOT, Road Tax, Insurance etc. Most of the working non-electrical parts are standard cycle parts so day to day servicing like tyre or brake replacement will seem very cheap for people used to paying for car repairs.
Health and Hills:
It is said that a conventional bike will keep you fitter. That, of course, depends how much, if at all, it is being used. Because riding an electric bike is such a pleasure even in hilly country, or into the wind, their owners tend to ride them much more often than conventional bikes. The motor provides up to half the effort, but regular use means more exercise for the rider.
If you want some strenuous exercise you can always switch the motor to a lower assistance ratio or turn it off completely.