I am not sure how much people spend on race cars, but I could build something similar to White Zombie for 25K-30K, including Lithium battery. How much do racers spend on gas over couple of years? This is included in battery cost, so you have to factor it in when comparing costs. Charging the battery only costs $1-$2 in electricity.

If I could find a sponsor for the project I could make a nice EV racer.