I would say roughly 50 percent of things I have bought are counterfeit (books, all electronics, CLOTHING, you name it!) It is, frankly, going to end Amazon as a company eventually but they do not seem to give a shit.
Curious: how do you know so many items are counterfeit? 50% is a pretty high number. I order from Amazon once a month or so, and I can't think of more than one thing I suspect of being counterfeit over the past year or two, and even that I couldn't be sure.