There has been debate for years as to the correct pricing of books and I'm not sure it has ever got very far with the ongoing battle between Amazon & Hatchette as a prime example.
As an author, I believe if I put some effort into writing a book, (and I do - believe me - even if it might not look like it!) I think I am entitled to a reasonable return on that effort, whether that book be a traditional paperback or an e-book.
Ultimately, however, things are only worth what someone is prepared to pay for it I suppose, but personally I would rather that decision is made by an actual reader than someone who clearly has no particular interest in books at all and in this latter category I would include the likes of Amazon and many of their so called 'Amazon Marketplace' sellers.
Having found 5 apparently different sellers selling a second-hand version of one of my paperbacks for £0.01 I wondered what was in this for Amazon and or the 'seller'. I couldn't see what might be in it for Amazon - other than being right in the middle of yet another Internet transaction regardless of value, and clearly the reseller it seems to me must be expecting to make a profit on the £2.80 postage & packing charge.
However, when I extended my research to another of my books, I found this second-hand listing.
Things are now clearer - the true value of my books are somewhere between one penny and £2,500 each.
I'm not sure that helps in my marketing efforts...