Okay... With me, I have been on both ends of this issue. When I started to collect Dragon Ball Z figures, the only ones available were from Bandai. However, the only store that had any started off selling KOs and never said a thing. Did they know? I am not sure. I just know that their shops closed at some point but did have some nice owners in there. It was when I bought my cousin (who is now 21) a KO Trunks and seeing how the paint was peeling off how it is to be duped into buying what one thinks is an authentic product and ended up getting a KO product. And with Burn's mentioning of eBay, my last encounter with a DBZ related KO happened there. It happened shortly after my 1st or 2nd article was published by Beckett. I went on eBay and spotted a Dragon Ball game (assuming it is AF here) game. It was for PC and I tried reporting it as a fraud. And guess what? The best they allowed is to post a "buyer beware" post. Nothing more. So I ended up calling FUNimation and reporting this. I did get get some gratitude, but accidentally hung up (as I was a quarter awake) before the guy could ask me a question.
Beyond that, practically everything I was interested in have KO versions. DannyChoo.com even had a topic about this during the time Figure.fm was new. This was a massive issue for importing, as it meant that hardcore MISB fans had to deal with an additional sticker notifying them that it is authentic. Others in regions besides the U.S. did not have this benefit. So for them, everything ranging from Figmas to Transformers either had to be imported or they have to be cautious about where they buy. Is this fair for them? I do not think so. Because a collector has the right to buy what they want, but at the same time, a store owner should be obligated to say what is real and what is a KO product. Or just simply sell KO products that do not try to blend in with the originals.
Because what would you prefer doing? Saving up for an authentic Diaclone: Car Robot Powered Convoy DX that had never been open? Or save a few bucks and obtain a KO version, not knowing (or caring) that it is a KO? Think about that, and add the thought about those who will receive these from you as well.
As for me, I only collected Takara Tomy ever since I decided to return to this hobby. Mind you my collection is small, but I had been a fan since 1984. And I quit Hasbro because of QC reasons. And I know that TOMY could revive some older G1 molds with today's technology. But I do not expect them to on account they need the financial foothold to stabilize in Japan before they can toss money into such a project. So for me, I have a new G1 series to enjoy as it has me hope they will redo some of the characters in the series. But until that day comes, I am happy with what I get... And will never be upset if I do not have the chance to own a reissue of Ultra Magnus, Alert, Lander, Star Saber, or even Dai Atlas... Just to name a few. Because as a non-KO collector, my dignity in that respect is greater than the need. Because the need will always be there, but it will not have me toss who I am in this community. Hence why I am going to say that if you want to collect KOs... Do such. Just do not dupe the rest of us in the long-run, okay?
Oh... And the series I stuck with is ALL SPARK. Granted, it is off-topic, but it does show that Takara Tomy is trying to preserve its G1 roots. That, after seeing Chip, the Dinobots, and Nemeis Prime make their debuts this month... It had me hope that it will become a toyline that coincides with Generations. And that itself has me not want to buy any KOs for any reason.