They are paying to hand on the time, hassle and knowledge risk. Whether that is paid at market rate or at what the time analysis suggests is fair is the query I have raised in post 10.
The general answer, that the landlord has taken on the risk, is a capitalist answer. Yet the query attacking the agent is a socialist one. Surely, in order for such a debate to be a fair one, the attacks and defences have to come from the same agreed stance on the balance of capitalism and socialism?