The good thing about "Planet Comics" is that there really isn't a book within the run that's extremely undervalued in the OS guide. Your purchases will probably vary between 0.8 and 1.3 times guide for VF+ and lower books. Other GGA titles do have some books (Brenda Starr #14, Blue Beetle #54, Junior Comics #14, Wings Comics #89-91, Phantom Lady #23, Jo-Jo Comics #25, etc. ) that are completely out of wack when compared to guide.
A Very True Statement.......
But that's what makes it fun.
For dealers.