do athletes maintain a day time job or does their club pay them?

I am pretty fast and run the 100m in 10.8 secs (my personal best), but I know I can do better since I never trained with a club a day in my life no do I train alone. So I guess I am just naturally fast.

What I wanna know is how I would make a living if I took track seriously and considered the Olympics. Joining my Uni's track club is a great start since I can get a scholarship but what happens after I graduate and join a local club associated with USATF. Does that club pay its members some kind of stipend to train at nights and weekends.

Or is it up to the athlete to maintain a full time job, still attend training & events and also pay for equipment?

I asked since I doubt Bolt works but yet still he lives a great life. I recon he lives off his Olympic money and endorsements. But how does the striving athlete survive and afford the luxury of training full time without having to work a 9-5?

Thanks