Print book publishing has changed almost completely from the days when the first editions of Jack's gas pump books came out. Electronic books have taken over in mainstream publishing. Print book stores have been closing, more each year. Small volume books about collecting and hobbies have almost dried up. A bunch of publishers are out of business.
We are fortunate that Jack Sim is bucking the trend. He is taking on a project personally that the publishers just won't do like they used to.
Plus hobby price guides that list individual prices,become nearly obsolete the minute they hit the shelf.
Thanks to the internet,today's world of instant prices on nearly everything,fluctuates in both directions daily.
Good for Jack for doing this,as well as keeping the pricing number out of it.