Person A bounces a credit card payment to MegaBank, MegaBank asserts their credit card is in default and demands full payment immediately, A does nothing, MegaBank attempts to collect fruitlessly for ~4 months, A does nothing, MegaBank sells debt (principal + interest) to Agency X, Agency X attempts to collect fruitlessly for 18 months, A does nothing, Agency X sells it to Agency Y, A does nothing, Agency Y attempts to collect fruitlessly for 12 months, A does nothing, Agency Y sells the debt to Agency Z, A does ntohing, Agency Z attempts to collect fruitlessly for 12 months, A does nothing, Agency Z sells the debt to OWS for 5 cents on the dollar.
Each time I say "fruitlessly" read "They autodialed them between 2 and 5 times per week plus sent biweekly dunning letters."
For your added edification, while MegaBank, Agency X, and Agency Y all have no interest in the debt after it is sold to Z, many of them have very terrible recordkeeping practices, so it is entirely possible that e.g. Agency X will attempt to collect on the debt even after selling it, and potentially even after it is cancelled by OWS. Person A may not notice that this has happened, because Person A is likely a) delinquent on more than a dozen similar debts and b) Person A very likely has a very different level of personal responsibility as compared to many people in your reference set.