Invest your time is pretty different than investing your money. People are too lazy to do something more in their free time. They rather take the money and put into the quick rich scheme because they believe that one day they will find the hidden gem. 
It caused by they were thinking if they can make money instantly and why do they need to waste a lot of their time? This is can happen when it comes to invest in a legit platform but what happened when these people investing in the scam project or even ponzi scheme and they will be actually getting scammed.