Imagine a guy that pays a million dollars for a bread roll, while in the same time he can buy it for $1 at other bakeries. Such scenario would be crazy because no one would give million times more money for the same thing. That is why the above scenario is not possible in reality. But... in the crypto world, such scenario is exactly what can be observed.
In the crypto world people are paying million times more for bitcoin than for altcoins, even though these coins essentially have the same features as bitcoin. Functions and features of cryptos are pretty straightforward. Elimination of expensive brokers, lawyers, and other typical middlemen. Low transaction costs. Transactions are transparent, quick, permanent, and hard to fake. Cryptos that are priced below $0.001 have all these functions and features. But despite that people are paying thousands of dollars for bitcoin.
Alts don't have the same features though, do they?
They don't have the network effect. They don't have the liquidity, they don't have listings on all the exchanges against fiat.
It's only worth investing in an alt if you think it will gain network effects (or if you are willing to invest time as well as money to build those network effects yourself).