2019 MARKET UPDATE: SOME GAINS, GROWING PAINS
This book is super-obscure and one of the rarer B-list key issue comics of the Silver Age.
I see a few copies per year from lists of thousands of collections.
I still think it's got potential for increase, due to the ongoing expansion of the Marvel Cinematic Universe. It can be a tricky book to price in higher grades though.
Hold if you have one.
2018 MARKET UPDATE: 'GROOT' PRICES THIS YEAR
Not much choice -- solid gains. If you want to own a copy of this Marvel silver age key issue comic, then take what comes your way. Sales:
2017 MARKET UPDATE:
With the second Guardians of the Galaxy movie about to hit screens, and strong rumors of a standalone Groot movie in the works, this character's first appearance is still a hot property.
There have been no high-grade sales, and this is a notoriously tough book above the VG range, so if you see one in Fine or nicer, snag it.
"I am Groot." Three words which stole the show in the surprise hit Guardians of the Galaxy movie, and boosted the value of an Atlas pre-hero back issue that nobody cared about prior to the GOTG fuss. See Marvel Preview #4 (1st Star-Lord).
If you are lucky enough to flip through a stack of back issues from this era, you'll see that the Lee/Ditko combination created dozens of similar names:
MUMMEX, DROOM, TITANO, GORGILLA, KRANG, BLIPP, THORR, VANDOOM,
ROMMBU, KLAGG, TRULL and MOOMBA
to name just a few.
With a sequel planned for GOTG, Groot is here to stay. That, combined with the scarcity of this pre-hero Atlas book, means it's a good investment.
Other Tales to Astonish books on the Hot 100: