Is it obligatory to pay the money owed for using in-game services obtained through illicit means, despite having no desire to restore the account or play again?

What you did — deceitfully benefiting from services that require payment — is not permissible. You must guarantee what you benefited from by paying its equivalent to the service provider, unless they absolve you. Your unwillingness to be held accountable does not exempt you from paying what is due from you.