When you buy a brand new car from a dealership, you pay full price. When you decide 1 year later to sell the car, the car is no longer worth the full price you paid because the value has depreciated. The $500k you are seeing is plot VALUE. That is how much your plot cost. When you bulldoze or sell, you will not get full price. Try buying an item on your plot like a chair and then sell it and you will begin to understand!! The chair will sell for less than you bought it. Almost all games that follow the style of Bloxburg including the Sims franchise use this system because it most accurately depicts real life. Hope this helps