Tesla is not luxury. It's an expensive car that does not look good and needs many hours to recharge. It's not faster or better than other cars, it's just needs longer to recharge.
If you are paying $80k for a car, you don't care about fuel taxes.
5.5 seconds isn't that great for the class of car it's in.
The Roadster is a sports car. It's 30k more than a 911 Carerra and slower in 0-60.
That said its torque curve is amazing which means you don't have to stamp on the gas pedal, and handle the transmission like a race car driver to get that 0-60 time.
If you are paying $80k for a car, you don't care about fuel taxes.