I think the kind of product in question has a big role. A handbag should be relatively easy to inspect; look at the seams and look at the material. If both are robust and you like the way the bag looks, then it's a good bag regardless of authenticity. But on the other hand, what about something like wristwatches? To inspect all the parts you would need to tear it apart, which just isn't feasible before purchase [if at all.]