How do you compare the stress of one job versus another? It's not easy! Working retail, you're often required to hit sales targets while dealing with demanding or even irate customers, and you're usually not bringing home big bucks for the effort. On the other hand, you also don't have people's lives in your hand.
Nobody's going to question that CEOs face a lot of stress. They have huge responsibilities, both to employees and to investors, with millions of dollars and countless jobs at stake.