Part of me wishes I had gotten a little more into modern keys just so I could take advantage of everyone who thinks they are paying for their grandkid's college education with first appearances of C list Batman villains.
This way I could put it more toward Golden Age.
These days, when I see a CLink auction, I look through Golden Age offerings first. After I am done seeing if there is anything I want for myself, I look at ASM upgrades and if there is a book I can justify upgrading at the price that makes sense, I look for anything else that I can easily flip.