There’s a great section of this podcast (from 7:21 to 16:42) where Doug Polk and Jason Strasser talk about the advantages poker players have if they start to trade … Strasser says:

"Coming from poker to trading ... where I was way ahead was that I had lost money before. That's the thing I had. I've had swings. I know what it's like to have a downswing. I felt like I was stronger mentally."

You should listen to that whole ~nine minute section closely.