Why? It is just playing with other people's money. There is nothing inherently stressful about, other than how stressful it is made by stupid humans.
"Stressful long hours jobs"....LMAO. Only because they make it so because the whole culture is toxic. "Oh no, i'm so stressed, i might not make the right gamble on the increasingly irrational, computer/AI controlled money/stock markets, and then i won't be mega rich".
Try being a nurse/doctor in a hospital through covid. That is a REAL stressful and long hours job and they earn a pittance in comparison. Someone's life potentially being lost compared with how many zeros you can add to an already large number.
The system is broken. Utterly and completely.