I can't afford $30K a year in gas tax or a Tesla. Most people can't.
But some people can. Then Tesla can get more business, they can come out with better and cheaper cars, other companies will be incentivized to sell similar cars, and someday your car will work that way too.
Say what you want about pencil pushers, they can usually do math. Most households pay about $3000 on gas per year. If you're worrying about paying $30K a year on gas taxes, that's some pretty serious driving.