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Perhaps there is some misunderstanding of the phrase ‘developmental editing’ used in this article. Given the number of hours necessary to process, dissect, and reconstruct a text of that size, it sounds like anyone who charged that lowly is doing the job for fun and has a spouse to provide for them–all the while devaluing the work of people who do this for a living. It’s really not ethical.
Lots of authors I know have a hard time finding an editor because they feel that they want to “know” their editor. This is understandable when you’re entering into a developmental relationship, but copyediting and proofreading are much more technical skills. The best copyeditors and proofreaders I know are freelancers who are hard to find because they’re working for publishing houses, and the only people who have access to them are companies and/or individuals with stables of editors they’ve cultivated over years in the industry. If you find a service (or individual) you trust with access to a stable of editors, be open to being assigned to one. Ask about the individual’s qualifications, and what other books they’ve edited, but let the trial edit be the deciding factor rather than any connection you hoped to have between yourself and your editor.
Regarding your last question, I know of no editor who gives a money-back guarantee for occasional errors that happen to slip through or for a different opinion by a later editor. I’m afraid such things are just the nature of the publishing beast. But by having a shorter portion edited first, you will get a decent feel for whether someone is the right editor for you, and will be able to be confident in his or her work on your entire book.
Call or write to the publishing company the editor works for to see if you can talk to them. You may be able to reach an editor directly by asking to speak with them at work. Send a formal letter or place a friendly call asking to speak with the editor. Ensure that you’re able to articulate why you want to speak with them ahead of time by practicing the conversation.
One thing is becoming clear to me. Authors and editors have been mistakenly pitted against each other by a self-publishing system that is not currently working. Remember in the scheme of things that self-pub is very new, only a few years old. Twenty years ago, publishers put out a selection of the best and most marketable books. Editors were well-educated and got paid a fair wage. Authors received advances and royalties.