Here's another way. Manipulate prices on everything in the core index (staples, energy) so that "necessities" (food, transportation, insurance, housing) approach 100% of a poor person's income. This will condemn them to never be able to pay off their debt, letting you reap endless interest payments off your initial lending investment(s).
That's a unique loophole in the justice system. Sounds like the best solution is to limit the number of times per year a debtor can be called to court.
Another solution is to eliminate payday loan companies, or regulate their interest rates to a reasonable fixed percentage above the prime rate.