On price, it appears that print runs are low and popular or fashionable works sell out quickly, then the secondary market steps in and prices rise. The secondary market is fed, it seems to me, by a number of "speculators" as the offerings are often brand new, seal unbroken etc and can only have been purchased with an eye to re-sale. I have asked around and received no satisfactory replies about the publishers, who like us can see this happening, and their reluctance to increase print runs. Of course they must take risks on some titles which do not sell out and make them a loss.