"The security they crave turns quickly to complacency, and they wind up dissatisfied with a job they're afraid to leave."

Great quote.

Err, neither the word "incentive" nor "structure" appears in this article. Infact it's solely about whether there are more "dirty jobs" for men than women

He's saying that the gender pay issue is secondary to the fact that the way most people are payed is not motivating (ie fixed salary). He says that a pay for end product arrangement is better and in such an arrangement issues of pay inequality wouldn't exist by design.

The words may not be there, but the concepts certainly are. Most directly in the penultimate paragraph.

He is referring to one specific job featured on Dirty Jobs that he believes has a better incentive structure (results instead of hours).

The title is a little off because it isn't about dirty jobs having better incentive structures, but rather an incentive structure which he explains is fair and rewarding to everyone involved and additionally resistant to racism, sexism, and other discrimination.