Monopoly Mortgage Values

In Monopoly why is it worth the mortgage on a property title?

I play the game and I need to know all the advantages of owning property monopoly.

If you owe a debt and not enough money in hand, you can mortgage assets to pay the debt. The mortgage value is half of the purchase price of the property and you sell houses or hotels on the property for half their purchase price before the mortgage. If at some point, you're in a situation desperate, you can remove the mortgage by paying the price of the mortgage bank 10%. If you receive a mortgaged property in a trade, you must pay the bank 10% of the mortgage immediately. If you repay the loan later, another 10% is then due.