A drop in salary

A man came home from work one day to find his wife sitting on the front porch with her bags packed. He asked her where she was going and she replied "I'm going to Las Vegas."
He questioned her as to why she was going and she told him "I just found out that I can make $400.00 a night doing what I give you for free".
He pondered that then went into the house and packed his bags and returned to the porch and with his wife. She said "And just where do you think you're going?"
"I'm going too!!" he replied.
"Why?" She asked.
"I want to see how you are going to live on $800.00 a year"!