A job has a value. A business cannot pay more than that, or they will not be able to remain a going concern. Businesses cannot simply raise their prices in a competitive market, nor can they operate at a loss to pay their employees more.
You might be surprised how little bottom-line profit most small businesses generate. It's maybe a few percent above what a savings account would pay. If they can't earn enough to compensate for their risk and time, owners will just close up.