It’s quite sad as your friend has created a theory that keeps him motivated enough to continue gambling even if he continuously looses. I doubt he hardly thinks of his losses as he probably has his eyes set on the big win. The big win that’s just around the corner.
An average gambler cannot afford to play daily with unrealistic hopes of winning it soon. He could lose literally everything and if he takes such an advice. Addiction would not far off as well. Your friend needs help and definitely need to take some time off gambling.