At the end of the day pokemon cards are still a collectible and aren’t a commodity like precious metals, oil or lumber. People don’t need them to survive and so they’re always at risk of high fluctuation due to the economy and peoples’ interest. The Pokemon Company could make lots of (or one very big) bad decision(s) and cause mass loss of interest in its product, we just don’t know. I don’t see it happening anytime soon but that doesn’t mean it can’t happen and that’s just the risk you run when you “invest/speculate” in collectibles.