There's the additional problem that a traditional book store has huge advantage in selling limited edition signed copies of books, which I've seen in local book

There's the additional problem that a traditional book store has huge advantage in selling limited edition signed copies of books, which I've seen in local book stores many times, but I've yet to see in a big name book store. I remember seeing a Charles Stross book selling for around $50 signed. I saw a signed Nights Dawn Trilogy for what would have been $400... all used books. I wanted to ask what the signed (second edition IIRC) copy of The Colour of Magic was going for, but I didn't dare as it was locked up behind the counter and I knew I'd want it!