1. The regenerative braking means you do not need to replace your brakes nearly as often. (Tires are a different story.)
2. There are far fewer moving parts than a normal car. This decreases the amount of maintenance you need to do.
3. Since there are no moving parts, it's less damaging to the car when drive it hard. Accelerating quickly with non-electric sports cars wears out very expensive components very quickly. With an electric car, you can get that 0-60 performance every single time you accelerate without wearing anything out. (Except the tires.)
When you're comparing the annual fuel bill to the extra cost of the Tesla, don't forget that you are buying a premium sports car. Something like a BMW M5 gets 14/20 MPG, and expects that you feed it premium fuel.