* Selling their debt is quite profitable for payday lenders, so they are incentivized to make bad loans.
* Logically you can't pay a payday loan back of you're living paycheck to paycheck.
* Payday lenders nearly universally skip around federal and state regulations by incorporating in Indian tribal areas
Most people do payday lenders and installment lenders together. While there are bad players in every market, the competition/state/federal oversight in the installment space makes it a much better behaved industry.