Recent quote from Ken Goldin on
Sportscollectorsdaily:
“There are significant high net worth individuals who have decided to put millions of dollars into sports cards,” said Ken Goldin, Founder of Goldin Auctions. "New people are coming in each day.”
There's your demand, and we all know what that does to a fixed supply. I believe this has much more impact than the 50 year old guy returning to the hobby after 20 years off to pick up a few of the cards he missed.