Take for example Zilliqa, Tomocoin, NEO, DragonChain, etc. People who bought them in large quantities became richer. Why do you think this is garbage?
the problem and the reason for that behavior is perfectly clear in your own question! read the bold part again. cryptocurrencies were not created to make anyone rich, bitcoin was created as a decentralized currency to fulfill some problems that the old system has. read the bitcoin paper's first page to understand its purpose better:
https://bitcoin.org/bitcoin.pdfso when something else is created (the altcoins) with a purpose other than bitcoin's that is what makes it garbage.
Bitcoin is a legend, but some altcoins are worth paying attention to, aren't they?
as long as this attention is only to make money from it then don't come back and compare them to bitcoin then. go make your money and accept the fact that they are made to get pumped and dumped and make you rich not to be anything else.
and that is the heart of the problem: you not accepting what you really are doing.