Why are so many people investing in the top -20 cryptomonettes? For most, there is a psychological factor that makes it difficult to look at crypto differently.
Because that's the easiest way (as they suggest). They do not want to spend their time studying projects from the first and second hundred (and maybe even further) to find an interesting option.
Investing in the top 20 is the easiest and at the same time risk-free and reliable way to invest. The greater the profit, the greater the risks.