When I first started diving into collecting GA books, Bats 1 was never on my radar on must haves solely due to Robin on the cover and it just didnt do it for me. Cover is bland..
After talking to collectors, dealers, and reading the boards it started to grow on me and the fact that it is the 1st app of Joker, which is HUGE!!! I cant think of any bigger DC villain than Joker..
Also, #1 helped too! So ya, even if there are so many copies floating around compared to other major GA keys, I have much respect and love for Bat 1.