The first and foremost challenge in a small time investor is the lack of funds to invest. This means that they cannot rebuild as fast as the rich people because they lack the resources and have only gained too little to nothing hence they do not have enough savings to back them up if they need to rebuild their investments to get back what they lost.
I totaly agree also one of their challenges is that they after they get their profits along with their ROI, they then to use all their profits per for personal use since they really need it. So they cannot have a bigger investment the for the next time. This is not to mention that their risk is much greater since most of they are already putting most of their capital and if they lose they have no money to reinvest again.