Why is the banker so full of contempt at the end of The Bet?

At the end of Anton Chekhov's "The Bet," the banker is filled with contempt because he realizes that the lawyer, after enduring fifteen years of solitary confinement, has chosen to renounce the monetary prize rather than accept the emptiness of wealth without meaning. The banker feels a mix of fear and shame as he recognizes that his own values and motivations have been compromised; he had been willing to kill to protect his wealth. This contempt reflects not only his disdain for the lawyer's apparent madness but also his own moral bankruptcy, as he grApples with the futility of his previous beliefs about life and success.