How do people that compete in striking arts hold down a job?

So for those of you who compete in serious striking arts that spar hard and have very competitive tournaments: How do you hold down a typical 9 to 5?

This all came about during a sparring session on Friday. I have sparred before but have never really got clocked good. Well on Friday the person I was sparring with slammed me in the face hard with a roundhouse kick. I then got a HUGE bruise on my face and everyone is like, "Are you okay".

This got me thinking, "How do people compete in serious striking tournaments and still hold down a job?"