The boss of the car rental company is rich, and the cars of the car rental company are basically not expensive. They are all ordered in large quantities from the car factory without going through the 4s shop, so the price is low. In addition, if you take a certain model in large quantities, you may order some castrated versions, and the profit will change the seats or sound system into cheaper ones, so the price of your car is much lower than that on the market. This reduces a lot of costs, so car rental owners are rich, with low costs and high profits.
Car rental refers to the separation of the right to use the assets of the car from the ownership. The lessor has the ownership of the assets and the lessee has the right to use the assets. The lessor and the lessee sign a lease contract in exchange for the right to use the assets.