From GraphJam, I think its a really funny graph, mainly because its so true. I remember back when Magic cards were first released, and how little interest I had in them. I couldnt understand why people were actually throwing down thousands on them, considering the fact that it was a game rather than a collectible. Magic cards have since blended the two worlds and brought about some of the most valuable gaming cards EVER. The funny thing is, that back when I was a kid, I shunned Magic cards for the obvious "better" investment in baseball cards. Of course that was completely stupid, as the Magic cards from that era are worth thousands, and my 1987 donruss set is worth less than the cardboard it was printed on.
Moral of the story: never underestimate the power of nerds when combined with collectability.
As a self proclaimed nerd in many definitions of the word, this should be gospel to all.