I don't collect KOs either for similar reason as Sky Shadow - You know they are not real and unlike most of the 3rd party fan stuff, they are straight rip offs often sold with the intention of deceiving the buyer that it's the real thing. I have tried very hard to avoid them while collecting G1.
However given the circumstances of G1 KOs being constantly released with new ones announced almost every couple of weeks, it's a good idea to keep up with news about them. That way you are well informed in avoiding them. When I was collecting G1, I prioritized which vintage figure to get next based on what KO was announced, that way I was assured to buy the legit figure before the KO hits the market. Like when I heard about the Sunstreaker KO being released soon, the first thing I did was go on ebay and buy a vintage that way I was assured that it was real as the KO was yet to be released.