Thanks for the help guys
What i meant with popsike not telling the whole story is based on my (and i'm sure others) experience - popsike indicates certain prices but in real world they could be going for more, or much less. Well you know what i mean.
Although i do realize that price has dropped quite a bit, the main thing is that it never sold on discogs.. nor i was able to find a single sale here. So some potential collectors with cash might have missed it on ebay and there wasn't a single set sale on the net (at least i can't find it). And there weren't like loads of copies on ebay... some of them could have done the round twice. Big thing though is that Dave told me that there was a Manships copy auctioned recently which didn't fetch much. Still i kind of feel it's a tricky one to price - probably what you've mentioned, but it might go for much more to the right buyer.