Few guys "choose" professional BB as a profession, more or less, they find themselves in a position that it's a reality that they can make a living from competing/ endorsements/ etc.
That said...BBers are into competing as a goal, a challenge, to try and best their last outing....it's much more of a goal to win a ational championship to them, then lets say....showing up for work, or getting a dollar raise after 6 months of work.
It's all about the mindset of the athlete....keep in mind also....most of the pro's have other business ventures their into, or work some sort of job as well.