It is. While the pricing model makes sense from a rational perspective, it just doesn't fit well with most people's emotions about fairness.
When you get to the end of the charge on your 40kwh model, you know that the car is capable of 50% more - but you are not allowed to because you haven't paid Tesla an extra $10k.
It's similar to airline pricing. It makes rational sense to sell early seats at lower cost, and increase prices as the plane gets closer to selling out, effectively auctioning off seats. But people hate it. The guy sitting next to you is getting the exact same service as you, but might have paid 3x less.
