Loss Vegas joke

A guy comes home and finds his wife sitting on the front porch with her bags. He asks her where she's going and she says "Las Vegas. I hear I can make $400 there for doing what I do with you for free." 

He tells her to hold on, runs inside and a couple minutes later returns with his bags. "Where are you going?" She asks him. 

"Las Vegas," he replies "I've got to see how you're going to live on $800 a year!"