I think the biggest hidden cost is the lack of structure and social balance. When poker becomes your full-time job, it sounds amazing because you have freedom, but that freedom can easily turn into isolation. There’s no boss, no schedule, and no one forcing you to take care of yourself, so it’s easy to develop bad habits like sleeping at weird hours, sitting for 10+ hours a day, skipping exercise, and constantly thinking about swings.
The mental side is also underrated. Even when you’re winning, there’s always pressure because your income depends on making good decisions every day. A bad month can affect your confidence and mood in a way that a normal job might not. I think the players who last are the ones who build a routine outside poker, keep relationships strong, stay healthy, and treat the game like a business instead of just playing whenever they feel like it. The money and freedom are great, but the lifestyle discipline is what most people underestimate.