Comics and comic book media-related shows are currently going in the same direction as baseball cards did.
My kids are in high school now, and the comic book hype has gotten so big that we recently had a big ComicCon here in Ottawa, with some relatively big names appearing, including William Shatner. So a lot of their friends were all hyped up to go, including one guy who blew his entire birthday $$$ on bringing a pile of friends there. Of course, there was little information on in-show costs (the website said it would be "coming soon" but never showed up) and there were huge Facebook threads about "how much are autographs/photos" and "how much are the discussions?", etc. but again, the organizers kept their mouths shut. (After the Saturday show, some nice folks posted itemized lists of the inflated costs, and there was a healthy slam session after that.)
So these hyped-up teens flow into the ComicCon floor (at $55-$150 a ticket) only to find some seriously high-priced autos, like in the range of hundreds of dollars (and some no-shows) - a huge tomato surprise given that the Con website had absolutely no info and facebook inquiries went unanswered. One girl who paid for her entire family said "there was nothing to do but walk around" as everything was vastly overpriced and scams and ripoffs were everywhere. One jerk was selling "Mystery Boxes" with action figures and toys, and one guy showed his and it was 2 USED and broken action figures that wouldn't sell for 10-cents BNIB. The current joke that day was "Now I know why they call it a Con", which was pretty amusing to me.
As my kid told me on Monday, they were still extremely angry and bitter about being scammed. It was the biggest letdown that many had experienced in their short lives and the poor guy who blew his birthday stash was still irate. They had pocket money with them, like $50-$75 for spending, but that doesn't do squat when the autograph you want is $200 and pictures are $100. None of them intend to attend another ComicCon. These pseudo-celebrities realize that this gravy train won't run forever, and are trying to bleed the nerds dry as fast as they can, but this whole cycle of greed is just going to kill off the phenomenon even faster.
Greed kills hobbies, and I remember the exact same thing happening with card shows. I used to take my dad to shows during the mid-late-80's, and it started with free admittance and stars like Bobby Orr, Gordie Howe and Bobby Hull signing autographs for FREE (yes Virginia, it did happen), to the 90's, walking into a $30 show and seeing minor leaguers and never-been's selling their scrawl for $100 or more. I walked out, and never came back, just like these kids at the ComicCon.