Why would a bank lend you money for 10 years if they will be paid back less than they loaned you??The loans are still calculated on your ability to repay them through income. So you'd borrow 100k and have to repay 99k over 10 years for example. You still have a $9900 loan repayment. In the meantime, you have a big pile of cash you can do stuff with.
Make sense?