Majority of Pro BB's come from poor families as a matter of fact. This phenomenon is even more drastic in Eastern Europe, Middle East and Russia as well as many former Soviet Union countries.
They train with what they have and show an immense amount of dedication as they step up their games. A sponsorship gradually allows them to be able to afford more gear and food, which is how they rise to the top.
This is how it also worked for Jay. Do you think the guy would be getting money from his family at the age of 38 to buy gear and food if he has not succeeded the way he did?