If it's $100 you walk away, and if it's $100,000, you're less likely to. The problem is, it's not quite a sunk cost -- you may still have a chance of recoveri

If it's $100 you walk away, and if it's $100,000, you're less likely to. The problem is, it's not quite a sunk cost -- you may still have a chance of recovering it. But that hope is also what the person who owes you may use to con you into doing more work for free.