MDtR, thanks for the insight.
I think that walking has a whole lot more to do with losing a valuable customer rather than any short term financial penalties.
I remember when I was hired at United back in 2000. One of the management personnel stated that 5% of our customers generated 20% of revenues and 1% of our customers generated 10% of revenues. Or similar lopsided numbers.
There are customers that a business can afford to lose. Top tier customers are not in that class.