It's not only lookalikes that plague Amazon, but also counterfeit products. E.g. my girlfriend once bought a Playstation 3 controller from the Amazon marketplace. When it arrived, it looked virtually identical to the controller that came with the PS3. I did notice that the quality seemed a bit worse, but assumed that Sony opted for cheaper production.

Fast forward a few months, and suddenly the controller stops working. After checking some websites, we found out that Sony disabled some series of counterfeit controllers.

Luckily, Amazon refunded the money. But it is still a nuisance.