Anything you truly understand and become professional in, you’ll find it’s hard to make money.

You'll encounter all sorts of obstacles.

As a novice, there may be small joys; as an insider, it becomes mundane. Go further, and you'll find yourself facing problems.

When capital is small, you can grab any opportunity and correct mistakes quickly because you're small and can always find a counterparty to unwind positions.

As capital grows, many opportunities that work for small funds become traps for you. A small player can enter and exit quickly, but once you're in, you're trapped because there isn't enough market depth to absorb your exit.

The bigger you get, the more painful it becomes.

You can't control those below you. Like the Yellow Lion Grandson of the Nine-Spirit Primordial Sage causing trouble everywhere, dragging others into it and disturbing the heavens—only to be beaten bloody by the lion tamer's whip, unable to even cry out.