What the writing industry has done is turn writers into feeble and helpless individuals who truly believe they can't operate without an editor, a copy editor, an agent, and a helping hand guiding them every step of the way. As if they were five year olds. Writers don't seem to realize that it's in the interest of editors to tell you that you have to have an editor. It's in the interest of agents to tell you that you must have an agent. (At 15%.)
Or, as in so much else, it's all about the money.