I've always thought the Worlds Best 1 is an iconic book and a number one of a long running series. The think I like about NY Fair 1940 is it is the first cover with Superman and Batman on it as well as a much better cover than the 1939 version. So while they don't share a story internally until Superman 76, it's still significant in my book, and similarly iconic image as the WB 1. Still 1939 gives you get a 1st appearance of Sandman which is pretty sweet but the cover is. I always hated the reference to "blond haired Sueprman, like who gives a mess.
All 3 of these tend to be heavily overpriced in Overstreet and often restored with color touch or something. And they are in plenty of supply though in reasonable demand if you can get the book VG or better unrestored. Part of the problem is they seem to be on every dealers wall, priced at guide or more, and never sold even after 10 years.
Like Bill, I like the book and priced right it's a sweet book to own and even resell. Any book you overpay for or with undisclosed restoration is always going to leave a bad taste in your mouth. Bill got the book from me for a very good price with the c.t. disclosed so I imagine he's pretty happy. The book I showed off was where I got the cover for just under $200 off ebay and had to pay Metro for a front cover missing issue of $400 which I thought was too much but hey, a nice low grade married copy of this iconic book for $600 seems pretty decent. Everything has it's priced, just not priced correctly in Overstreet.
Ed