Dyson's whole lifelong strategy is to disrupt the product and the price. When his vacuum cleaner came out the price was astronomically expensive. People were dumfounded - who would pay so much? But the product was better and people accepted the new price. It still seems high today but it was so successful it somewhat permanently moved the needle on what people think was reasonable.
He also tried this with: fans, washing machines, hair dryers, hand dryers. Some less successful, but an unexpectedly or apparently unreasonably high price is probably deliberately part of his approach.
Most likely because of batteries. He doesn’t have volume to build his own battery factories, but buying in small quantities makes his cars expensive. Now if car you are trying to sell is more expensive than Model X or Cybertruck, customers naturally would ask “Why?”