The market has shown that this statement is true. Everybody understood this perfectly well before, but everyone is striving for easy money. Now investors have become very cautious, but it is not for long. As soon as a new wave of hype comes up, many will forget about caution.
Experienced investors do not forget about caution, but when the market recovers and there will be a new wave of HYIP, some coins will be profitable through speculation, not even having a product.