Keep in mind that what people know, they think is correct, until someone corrects them. I can't really blame people selling guns as something they aren't, if they don't know any better. Especially since there is SOOO much incorrect information about the SKS out there. Keep in mind, it's really only been about 5 years since we've really started figuring the truth out about these rifles. Before that, you've got DECADES of guessing and misinformation.
When looking at SKSs for sale, these are the most common misrepresentations that I personally see:
"rare jungle stock"
"rare 20 round magazine"
"rare paratrooper model", or the fact that a para'd SKS has any more value than and non-altered SKS.
"rare SKS-M or Sporter" (they were the MOST common commercial model)
"unissued, never fired" because it's in a box and has cosmoline in it.
But like anything for sale, it's buyer beware. If you don't do your homework, then you can't complain if you overpay for something. It's just a shame that there are nice guns for sale out there that some of us won't buy because the asking price is ridiculous.