'Expense' in the Bible

Then all the men of Judah answered the men of Israel, “Because the king is a close relative to us. Why then are you angry about this matter? Have we eaten at all at the king’s expense, or has anything been taken for us?”

Who at any time serves as a soldier at his own expense? Who plants a vineyard and does not eat the fruit of it? Or who tends a flock and does not use the milk of the flock?