Fair point, but if I can't tell that the good is fake, even after using it, I don't care that much.
It could be I'll order Dove soap, get counterfeit, and incorrectly assume Dove soap sucks, but mostly I'm ordering brands too obscure to bother faking, or brands I'm familiar enough with to realize the bad counterfeit isn't the real thing. (But like ma2rten, I don't think I've ever gotten a counterfeit.)