[bhupy]

I'd argue that this is a feature, and not a bug. It gives the lower-income worker leverage to walk away from a bad job without fear of starvation.

[RangerScience]

Yup. If all jobs have to compete with the null-job, then there will be no jobs worse than just getting up to your own devices.

[andrewflnr]

Absolutely, this is one of the most important reasons to have it IMO.