Yeah your quoted passage seems more like a general argument against non income producing assets like gold or something. With a collectible (but honestly you cou

Yeah your quoted passage seems more like a general argument against non income producing assets like gold or something. With a collectible (but honestly you could mostly say the same about gold), you are betting that it will become more scarce (because people use up or throw out or lose current stock) and / or demand will grow but they won't be made anymore. Both of these things are reasons why a collectible would grow in value faster than the economy. Like any investment, there is a bet being made. But as you say, you could argue that nothing can increase faster than the economy for the rest of time without overwhelming the economy, but that's irrelevant.