It's not abnormal
The battery, not the motor, is the most expensive part in an electric car.
There are electric car makers who sell you only an empty car, and rent you the battery.
e.g.: Renault's Zoé
These cars are rather cheap.
(And in case of the Zoé, Renault have stated that:
- they DON'T do remote kills, even if they technically own the battery
- in fact they don't do any DRM on the battery
- you could in theory stop paying the battery, bring it back, and refit the car with something else (yup, they are open to the idea of 3rd party battery market that is eventually going to appear as e-cars get more popular) )
(Disclaimer: there are Zoé in pool of cars at the local car-sharing company that I often drive).
To over-simplify to the point of carricature :
In a gaz-powered car:
- The motor is a horribly complex high-precision mechanical piece with thousands of precise components, gearbox and transmission system, etc...
- The tank is basically a huge jerrycan, with a simple cap at one end to top up, and a glorified faucet at the other end to bring fuel into the car.
(Yup I'm over simplifying but you got the picture).
In an electical car:
- The motor is basically just a huge coil almost directly connected to the wheel (well, not quite. There's a fixed ratio gearbox), and that's about it. It just spins faster or slower depending on needs, no complex transmission in play.
- The energy storage is an awfully complex beast: complex (and explosive) chemistry in the battery that requires either custom parts or in Tesla's case a complex grid of thousands of simple common off-the-shelf 18650 elements, with a very complex battery manager to charge and top up the energy storage while keeping the longevity of the battery, and a high power circuit to convert the battery output into what high AC current is precisely needed at the time by the motor.
So yeah, take the energy storage out of the equation, and the rest of the electric car is cheap.
Or in a different perspective: adding 10% more energy to the storage is a complex task, that is going to cost a lot if you pay the battery upfront (like in Teslas)
It's not like extending the range 10% in a gaz powered car (where it's basically about increasing the the "glorified jerrycan" about ~10%)
It's more like extending the power or efficiency of a gaz powered car (where it would need an entirely new and better mottor, which is also going to cost a lot).