I disagree. Assuming it wasn't a simple typo, it was almost certainly on purpose. The folks at GMAC aren't fools. They know that is grossly under market price - you could add $10-15/point to the price and still have it sell (or ROFR) in a heartbeat. They also know their commission is based on selling price.
It's hard to understand, but there are situations where people don't want to make a profit; they are just looking to get rid of an asset. You see such things with nasty divorces or when a large institution - a bank, trust, etc. - ends up with an asset they don't want. If they price to pay off the loan, they walk away and are done with it. If they sell at market price, they've got $1000 profit they need to do something with. It sounds crazy, but that can be a big problem. You have to find an account to put the profit in - you have to deal with taxes - you have to figure out who is entitled to the money, etc. When your lawyers are billing you at $350/hour, dealing with a $1000 profit can be more trouble than its worth.