Much of the modern financial system works on taxes, loans(financial leverage). The majority of cars and homes are bought on credit. There are people who are paper rich or have iliquid assets.
There are different levels of wealth. Not everyone who buys a RR is oil rich and can buy to buy one for three different homes. Furthmore there are many who can afford to buy a RR outright but have zero interest in cars or want discretion.
This leaves market of HENRY(High earner, Not yet rich). This includes athletes who are not smart about how they spend their high income which...............inevitbly stops. RR, Mclaren and Lamborghini also sell a decent number of cars to businesses e.g rental car companies, wedding car services etc.
Very few high-end brands exclusively rely on income from the 1%. This includes Hermes who sell $10,000 birking bags but earn the majority of revenue from selling perfumes and scarves to the wannabe rich.
For RR themselves, there are huge tax and financial benefits to developing zero emission cars:
-R&D tax relief
-Advanced Propulsion Centre (APC) funding
-Automotive Transformation Fund (ATF)
-Full expensing for equipment used to manufacture EVs