Scrooge,
You ask an interesting question. When I first started collecting circa 1981, I purchased about everything that appealed to me. When I married, I realized that my financial resources were limited so I decided to focus on some Harvey runs (Baby Huey Duckland, Tuff Ghosts, Sad Sack, Tracy, Dagwood, Blondie and some Richie Rich titles). I also decided to focus on an underappreciated area being anti-Communist comics. I have been actively searching for these books for over twenty years and I do not think I will ever complete the collection. The chase to find an aesthetically pleasing book, at a good value, is more important than trying to reach closure on my pursuits. If I did finish this genre, I would gravitate toward related issues such as Atomic Bomb themed comics or I would complete other Harvey titles.
Here is today's purchase towards my main interest. I know that 1956 may fall into silver age but I don’t lurk into that thread too often.