Mystery shopping is a self employed job where you apply with the companies that offer the work, contract with them on a job by job basis to perform work and get paid by the companies you contract. This site is a conversation among shoppers who do the work. I generally bring in $10,000 to $18,000 per year in fees and benefits to the household depending on who has clients in my area, how much competition there is out there and how far I am willing to drive. See the New Mystery Shopper area for information on how this works.