@Christina ********
it's because this is an imature car market and there isn't a great surplus, also as long as it drives someone will take it. A larger car market is still a relatively new thing and most buying and selling is still done through car dealers.
Even the way the transferring of cars and looking up the history of cars here is behind other countries with little of it being automated.
That website is a small one just starting, the biggest one in Thailand is one2car.com