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. 
Yeah, I think people who don't have any money on them are more willing to learn a new thing aka invest in their own ability than someone has money or can easily access it. If you have nothing, invest your time on your own skill and ability as it was the best way to earning money. Some investors grow spoiled from their fund and stop learning or improve themself.