This is because the investors in this cryptocurrency are preferring fast and profitable way of making their capital grow ,so in crypto market ,investors can directly buy and sell coins , so if you are lucky enough you can really gain something good from your investment.
I have read here a plenty of explanations but I still cannot say that EVERYBODY is investing in the market of cryptocurrency. yes, many people do it but still, there are the persons that trust stock market, and real estate more.