This phrase is an exaggeration, but it expresses the very low value that David showed for the army. Alternate translation: "are worth very little to you" (See: [[rc://en/ta/man/jit/figs-hyperbole]])
Joab imagined how David would have felt if Absalom had lived and if all the men who had fought to help David had died. He said this because he was angry that David was still mourning for Absalom. (See: [[rc://en/ta/man/jit/figs-hypo]])