I’m not sure how “quickly” this is happening… In my market report in the latest Overstreet (released in July, but written last December), I specifically called out video game comics as rising steadily in price. In my mind, titles like these Valiant books, DC titles like Uncharted, Dark Horse books like The Last of Us, and Marvel books like Blip have all been showing solid, continuing growth. Most ‘70s to ‘90s books with a video game connection are of increasing interest to buyers in a growing component of the back issue market.
I’ve also been buying up these Valiant books whenever I see them, but that’s an increasingly rare occurrence.