Therefore they buy unpopular coins with little money and they hope for them to become popular and give them profit but alot of them fail and others scam therefore investing in altcoins to make money become difficult for many but regardless of all this, altcoins are every important in the market as they help in doing things Bitcoin can't do. They help to give us bigger profit that it'll be hard to get from investing in Bitcoin.
I believe Altcoins are truly important in the crypto market because they come with technologies with (high speed, low cost, smart contracts) to meet user needs or promote on social media (memecoins). Most importantly, Altcoins help make the crypto market more vibrant, give investors more choices, and allow money to flow between BTC and Altcoins to create stronger growth and longer uptrends.
After the advent of Altcoins, the market has seen many narratives such as Layer 1-2-3, DeFi, GameFi, SocialFi, NFT, Metaverse, RWA, DePIN... these are things that BTC cannot create on its own. Crypto is just one side of the coin, the other side is blockchain technology, and I believe that new potential projects that are launched will actually be widely adopted in the future to bring more value to society.