The free market and capitialism working perfectly.
Its the plan the customer has chosen for their property. They could have chosen something else.
Its not unlike the practice of locking in a price, long term, for say natural gas at x$'s per therm and watching the price drop over time. You are still stuck paying the higher price over the term of your contract.
You make your choices and you then live with the outcome. No one held a gun their head and forced them to make this choice.
Harry is being wheeled into emerge on a stretcher bleeding from a gunshot wound to the gut. Doc leans over and says, "Intestinal gunshot surgery is normally $16,000 but today's spot price is $170,000. Guy over on the next stretcher is offering me $245,000 but you got here first and I'm not sure he can come up with the money. My staff is doing a credit check on him."
Harry looks over to his wife, Marge, and asks, "What do you say, re-mortage the house, pay him the $170,000?" Marge thinks it over, looks at the doc, "Operate on that other guy, I need to talk to my mortgage broker, see what the rates are. Harry shot himself cleaning his own gun, there has be to some personal responsibility here, we don't want to encourage moral hazard, do we, or who knows where we'd end up?"