Its not a scam, but I would still not pay them. I got my first ever Mystery Shopping Assignment from them. They are not a MSC, they are a jobboard of sorts. Not sure if MSC pay to list there or not, but you do need to pay to see most of the listings. I got a desperate scheduler that contacted me through their service, and I took the assignment I never paid them and found this forum shortly after that.
Lady Marius
Canadian Mystery Shopper