David Goggins and Scott Jurek were definitly not rich when then won their first important ultras. And according to their bio (didn't fact check it though), they trained AND had a job, which means either waking up very early, or going to bed very late.

I'd rather think that if you can run a 100K, you have the mind to overcome amazingly hard situations, and to keep trying, again and again, being in the game for a long time. Which increases your odds of success, so bigger probability to get rich in the end.