In order to check implicit biases that may appear in one's writing, it is often necessary to read a manuscript for prejudices. True, some may be intended as it works with the plot or narrative but it's best to be cautious. I have read many works and never returned to that author because of a slip up or slight at word choice or a bias based on falsehoods. I will read your manuscript and insure that your work is appealing to a wide audience and that none of your readership are offended.
Your trust is important to me which is why I offer a one week window for refunds. While I cannot give a total refund due to labor costs, I will gladly allow one week and return half of your purchasing cost to you.