I don't believe that this is what it is, let's face it the hobby has been booming since the movies have been produced properly the past decade. The hobby was nearly decapitated after the 90's, and has become not only collectible for collectors like myself, but for jumping on points for the next generation. My 2.5 year old already can tell you the name of all the avengers in the movie and hes not even 3. He loves Spiderman and not from seeing my comics, but because he is on everything for toddlers from clothes to toys etc... The hobby is finally becoming recognized by more then my nerd self, and it is being appreciated by those that would never have considered giving it a try. Walking dead TV show spurred new readers to the comic who originally thought it was always a tv show first. Cosplay at cons is being recognized by tons of online media, and contest with great prizes have been given away at many cons. The thing is Comics are at an all time high, and collectors / speculators are buying what they can when they can.
Sure Justice league adventures 13. superman adventures 5 and batman adventures 12 have suddenly become hot, but that is the nature of the business. What is hot one day may be cold the next, however sometimes hot becomes blistering and I personally don't want to miss out.