"Money makes money"
Also in the other hand. Imagine we have two traders:
1. A Rich one who doesn't need to go out and work and eating best foods and having best pillow

2. A Poor one who needs to go out and work and usually thinking about bills, etc..
Ofcourse, the first one can trade much better than the second one.
I hope all you guys be the first one with a good pillow xD
That is because of lack of money management, I believe that some rich people now also started from scratch like us, they are not born rich, they just have a good mindset that lead them to success. Everyone keeps complaining that only "rich" people are getting rich in trading because they have many money but the thing is, at first they are not afraid to take a risk in everything.