Meh, games just have a feel, there's no black or white rules or magic formula for price. Since this price surge in TG16 is resulting from spillover from Nintendo platforms, I assumed Air Zonk would gather more attention than DD or Jackie Chan. So I bought it and it has since doubled while DD and Jackie have stayed flat.
You don't have to agree, I just thought Air Zonk was obviously undervalued and it only took a few months to level out.