$478K for a Movie Poster and another not sold?
I don't think the question should be is it worth $478K - because it is worth exactly that as that is what the new owner was prepared to pay - the question in my mind is:
[a] Do you think it got enough coverage, specially given the price and the rarity?
If you do a Google New search for 'movie poster auction' (which is a live update), this is what you get: https://www.google.com/webhp?tab=ww&ei=5MFzVPesMMa48gXa4oDABQ&ved=0CAkQ1S4&gfe_rd=cr&gws_rd=cr&fg=1#q=movie+poster+auction&tbm=nws
Last count there were 64 articles, which is pretty good, then again Katy Perry claiming she was being stalked by Australian paparazzi was at 181 articles
[b] My other question (not being a horror fan/collector), is why does horror garner so much attention in poster collecting? Although truth be told I do think it's a fantastic poster design
0

Comments
The interesting thing to me is that no one has seen the film. A recreation was made from a collection of stills but it is likely that it would have been nothing like the original.
I think the price that was achieved just indicates that the buyers of Universal/Horror posters from this era have very deep pockets. It doesn't necessarily mean that posters from this genre are the best or even the most desirable.
There were many films from that era that were truly great and in some cases, posters for those films are incredibly rare but they would not go close to achieving the price that London After Dark fetched.
In any case, it was a great auction with some amazing pieces.
It is.
And also as far as we know this is the only copy. Dracula, The Mummy, Frankenstein all have multiple copies of their one sheets extant