Amazon seller Shoes19 sold me a fake pink Cardsharp knife. It is a piece of junk, Why are theer so many on amazon and Sinclair says they are all fake?

http://www.amazon.com/Credit-Sized-Folding-Pocket-Wallet/dp/B00KFVA8NS/ref=sr_1_6?ie=UTF8&qid=1406941253&sr=8-6&keywords=pink+credit+card+knife