Because you are penalized for not being a fortune teller. They are archaic because it doesn't work well in a modern market. Oh, it worked, alright. Right up until the housing market stopped going up. Then when it went down all that capital was tied up in personal debt. The bank got the house and their pound of flesh, for perpetuity. And I mean that in some people will never be able to pay off that loan and see suicide as a viable option.