The jail threat is not for the failure to pay -- there's no such thing as debtor's prison. The jail comes in because they've violated court orders to turn over information about their personal assets, information their creditors are entitled to now that they have a judgment. These guys are refusing to answer about their assets, which means they're violating a court order. And anytime you violate a court order, you can be held in contempt of court and therefore thrown in jail.