Remind me why this book is hot again? I see it on the copper age trending section of Lyria Exchange but for the life of me I don't know why the 1st Black Mask is so dang interesting to everyone.
This is just my thought, but after watching the Batman/Red Hood animated movie today I realized that Black Mask plays a big role in the movie. That movie is really popular on netflix now.
Probably a longshot on that, so its just a hunch.
Edit: Also, judging from the new Arkham Origins trailer, Black Mask is the primary villain.
As keys get out of reach, or people have them all and get bored, they look for the next thing to take off. Speculation (by thought and by word, not the investment strategy) about future break-out books is a popular pasttime, to which these very boards can obviously attest.
This chatter and speculation is the incubator of a key. A tipping point is reached and a book takes off, or ticks to a higher price point. It is not so much because a character appeared here or is this important, it is because we as collectors have willed it so.