This topic comes up from time to time in any number of Facebook groups or on forums, such as Hobby Insider or Blowout Forums.
For me, the answer is easy. It's this one:
So what is this card?
Back in 2010 time frame, Rittenhouse Archives held the Marvel license for trading cards. They produced a full set of cards for the first "big" MCU movie, Iron Man. Maybe you've heard of it...
Anyway, I was building a master set for the movie. It had some costume cards (including short-printed Obadiah Stane tie cards and some Pepper Potts bustier cards). It also had a handful of autographs, notably one of Robert Downey, Jr. While I was building the set, I picked up the the RDJ auto for $180 or so. A few months later I got bored with the set and split it up.
I posted the cards on Hobby Insider to sale. Someone offered me $250 for the RDJ auto. I thought sure, $70 profit for a few months of sitting in a box, why not?!?
Fast forward to today. That same card is selling for $12,000 or more.
So yeah, the moral of the story is NEVER SELL ANYTHING!
