Cheap fees and free marketing

How low will local agents go until they end up like Purple Bricks who recently announced their exit from the Australian market?

The fact is, agent commissions are geared to get a better outcome for the owner, which in turn achieves a better outcome for the agent. So why cheap fees?

If an agent is threatened by the skills of another agent, they often drop their fee to compete as they are unable to compete on sales process or negotiation strength. But if they give away their money that fast, wont they give away your money just as quick?