To be considered "pro" you need to be able to support your self. So you have enough money for basic things for a year.
-Bills (heat, gas, ect...)
-Health and car insurance
Basically everything you need to stay afloat plus filming and competing in one of the worlds richest sports. Paying for flights, gas, food and hotels and then still needed to pay off the basic things like rent, and phone bill.
Its like if a normal person working at MC Ds's for 15k a year but then spending 8k on traveling around the world. So more then 1/2 what you make is already gone to keeping those sponsors paying you. Its a game that never really allows you to save much if any money.
I really have no idea how people that do comps live. They have so much more to pay for, and so many more places to go.
I think alot of people that you think are "pro" aren't, and should be. I got really lucky with Traveling Circus, and wish the industry had more programs like that to help pay riders what they deserve. Even with internet money I still need to work to keep my self from going into debt, and I consider my self one of the lucky ones.