Well it's not simple task that's for sure. Practice and Hard work, heck I'ms till learning and I got tons of learning to do even still. For me it was all in a case of being on the right team at the right time. I've played for about 4 or 5 years in the tournament scene on and off. A new league is now emerging (GridFighters) and I was picked up by a team who was given a Pro spot in this league. It takes the form of Speedball and Target shooting.
The Financial Incentives are usually very little to none, depending on your team's backing and how much support you get from everyone and your sponsorships etc.. Usually your playing for free but your always paying for something weather it be practice paint($60+ a weekend) Transportation, Hotels accommodations, jerseys etc..
So we play to play not for the paychecks, we play for the pride, we play to have fun.