You're right because I have a lot of worthless coin in my wallet, there is more than half Million others are hundred thousand above. It can't be use anymore and just a decoration in my wallet and remembrance in such coin. That's why if you want to invest, always be careful and learn it very well so that it will not become useless in the future.
I think that your collection of useless coins will be replenished with new samples after the last dump of the cryptocurrency market. A lot of altcoins have lost up to 90% of their value and the expectation that the price will return to its previous values, at best, can take several years. But most coins will never recover in value.