I was hired by a couple of companies on a regular basis as well as solicited by several mystery shop and merchandising companies. Shadow Shopper is really a vehicle for other companies to see your profile and contact you if you fit their needs. The more places you register with the more offers you'll get.
Funny, I just received an email from SS for a video shop. I applied, did one new home development (target) a couple years ago, and just heard from them. Thought they were out of business, guess there up and kicking.
The Shadow Shopper provides me with most the companies I sign up with. Most the companies look at your profile therefore they want you rather then you signing up for them. About %50 of the companies that have sought me out add a $10-$20 bonus to their shops because the due date is comming up. I'm talking the $10-$20 on top of their regular payment. In some cases $40.00 for a simple 15 min. shop and 10 min. to fill the report. That's worth $40.00 and it's more then worth the GOLD membership for Shadow Shopper.