Doing it for free

A man walks into his bedroom and sees his wife packing a suitcase.

He asks, "What are you doing?"

She answers, "I'm moving to London. I have heard that prostitutes there get paid £400 for doing what I do for free."

Later that night, on her way out, the wife walks into the bedroom and sees her husband packing his suitcase.

When she asks him where he is going, he replies, "I'm coming too. I want to see you live on £800 a year"