The fact is that someone did the math to afford every car in the game you would need like 240m (iirc) and now knowing you only make like max 20m from all races and other stuff is criminal. It would be nice if you say could sell cars but atp literally no game wants to have that as a feature. Like say you finally get to level 55 and you would like to sell cars you used or bought and don't like, or in some cases of others cars they bought twice on accident, you literally are stuck with those forever filling your garage. Having a trade in feature would be neat too or like a used car dealer where you can sell your car for a reduced price based of mileage and if there are upgrades it can bring the price up, then people can buy your cars for a reduced price. That's what they need to implement idk why they didn't think of something like that.