I go to Sci Fi conventions, and authors who are paid 5 cents per book and pinch pennies routinely see people selling autographed books for double or more the MSRP of the hardcover -- and the autograph was given for free of course, originally.Personal pride is a factor though. If you made a product and saw it go for double, wouldn't you increase the price "slightly". I understand what you're saying how the prices gradually increase. Maybe the GG was a bad example because of the political be that the region has him through as of late.
On the one hand, seeing what speculators can do bites. On the other hand, some authors are going to self-publishing and selling their own books at signings, for the marked price, and getting enough to live on that way. They might not have thought of it if it were not for the visibility of the after-market.
To me, it is like that song "You can't always get what you want" -- I can still vape, there's no monopoly thing there, so if someone is going to show the original designers and crafters that they did a good job, hey, maybe those artists deserve to take a bigger cut before the next big thing makes theirs obsolete.