It’s why you will pay so much for a 1909-S VDB Lincoln, even though at any given time there are likely hundreds on the market. It’s why certain issues of 19th Century Proofs make for a really attractive subspecialty if all you want is pristine coins at reasonable prices. Demand defines and drives numismatics. Demand is your major criteria for choosing a price you’re willing to pay, and for what you choose to “invest” in if that aspect is high on your priority list. No use buying an expensive rarity if there are no willing buyers when you need to liquidate it.
I always invest in new projects, but with proven team. For example,I looked reviews and feedback on English site last week and found interestig project Lukki Exchange. Platform of exchange with gamification (pass the levels, earn scores, get rewards and monetize your achievements) is the idea of the team. As for me, the good answer to modern trends. Plus excellent reputation, convenient interface (so simple that even a novice trader can easily understand), and meager commission.