He's pointing out the risk factor, a severely (and deliberately?) overlooked aspect of the "income inequality" rhetoric. Consistency of income has it's own sign

He's pointing out the risk factor, a severely (and deliberately?) overlooked aspect of the "income inequality" rhetoric. Consistency of income has it's own significant non-monetary value. There's more to benefits of a job than just the paycheck, such as not worrying month-to-month whether you're going to make your mortgage/rent payment vs getting evicted. Many lower-paying jobs remain consistent regardless of whether you're sweating hard for 8 hours or watching TV for hours waiting for a customer to show up & need you for 10 seconds; that vs higher-paying jobs which are deeply connected to the actual value of every second of productivity ... everyone would like the profitability of the latter, but the assurance of income of the former can make it the better choice (given common circumstances).