That's not what's to blame. That's been going on since the birth of the serial superhero comic.
Comics used to cost 25 cents, printed on cheap nasty paper, printed in 4 colors with mediocre but serviceable art. They were cheap and disposable and kids could get them at 7-11 with the left over money from their slurpee. Then Jim Lee and other superstar artists happened. Paper stock went from cheap pulp to thick, acid free stock. Printing went digital, colorists went crazy, only books with either superstar artists or big name heroes sold, prices sky rocketed to 2, 3, 4, 5 dollars a book. Kids couldn't afford to buy comics so they thumbed through them at the 7-11, so 7-11 stopped carrying them. Comics slowly became relegated to specialty stores that were and remain intimidating to casual fans. The whole culture closed in on itself and became unfriendly to new readers.
So simply, they priced themselves into oblivion.