Almost everyone says you can't go by antique price guides as their values are very inflated compared to what one could realistically hope to sell for as well as the constant fluctuations in market values and geographic locations. This begs the question, then why are there so many of them being published? Are there any that approach realistic estimates? I am especially interested in Depression glass guides. I pretty much know the patterns now after researching them for months, but there is a wide difference between price guides (I have Gene Florence's 11th edition, a really old Kovel's and Hazel Weatherman books - my mom must have bought these when she started collecting) and even for the same thing on Ebay.