In the short story "The Bet," what lessons do the banker and the lawyer learn?

During his 15 year confinement the lawyer learns that money, material possessions have no long term value.  He had decided to forfeit the money and leave confinement 5 minutes before his time was up.  He has come to appreciate the real valuable aspects of life.  In escaping his confinement, he actually saves his life, since the banker has planned to kill him so as not to pay the money he can no longer afford.

The banker having gone into debt over the years seems to have become a slave to money.  He was willing to commit murder to save himself from having to pay the money.  The banker has lost his connection with humanity over the course of the bet, now only placing value on money.