Subprime Customers Why Do Lenders Do Sub Prime Mortgages Know They Are Risky? (what Are They Gambling For?)?

Why do lenders do sub prime mortgages know they are risky? (what are they gambling for?)? - subprime customers

Hi, this question on the crisis in the subprime mortgage collateral. Why do lenders (including those that went bankrupt on loan) money to customers in the first? In fact, what the benefit of creditors process the loan, plus interest?