Supply and Demand
In Singapore, the government tightly restricts the number of cars on the road, and enforces this restriction through an auction system for car permits.
As people scrap or export their cars, the permits are recycled back to the government, which auctions them off every month in a reverse Dutch auction (so the lowest accepted bid is the price that applies for the whole auction).
Lately there’s about 2,000 permits on offer every month and 3,000 bids, so there’s plenty of demand to keep the price high.