This seems like a good point. I'm not sure I agree about paintings, but sure let's take Pokemon cards. These have only a little bit of intrinsic value - you can use them to play a game that is fun for 8 year olds. They only become more valuable because people speculate that their value may increase in the future. Why do they think that?
Well, it happened with baseball cards and comics, and then everything else. But let's go back to baseball cards. Why did some of them become so valuable? Just a guess but maybe its because they became rare, yet retained nostalgia value. Kids who bought them in the 20s and 30s treated them like the worthless scraps of cardboard that they were. Most were lost or destroyed. But decades later if they came across some they evoked a powerful emotion, maybe the sort of emotion I feel when see the login prompt on a Vic-20 maybe. So they started collecting them, and of course they had the most demand for the legendary players who they idolized as kids, so the value of those went up. After that, its mostly just people speculating. But there was a kernel of real value there to begin.
Well, it happened with baseball cards and comics, and then everything else. But let's go back to baseball cards. Why did some of them become so valuable? Just a guess but maybe its because they became rare, yet retained nostalgia value. Kids who bought them in the 20s and 30s treated them like the worthless scraps of cardboard that they were. Most were lost or destroyed. But decades later if they came across some they evoked a powerful emotion, maybe the sort of emotion I feel when see the login prompt on a Vic-20 maybe. So they started collecting them, and of course they had the most demand for the legendary players who they idolized as kids, so the value of those went up. After that, its mostly just people speculating. But there was a kernel of real value there to begin.