I think you're proving his point: You've identified that the fraudulent items make it hard to trust the marketplace, and (reading between the lines) that has affected your habits in relation to the marketplace.

Yes, but I am one person. Their overall sales numbers show that I am a rare breed. With how bad Amazon has gotten in this regard, I would have expected sales to decline if people cared about it as well. Until they feel it in their pocket book (and it doesn't look like they are) they won't do a whole lot about it.