"Professional reviewers read so many bad books in the course of duty that they get an unhealthy craving for arresting phrases"

This quote by Evelyn Waugh talks with the trouble of being a professional reviewer. It suggests that the large volume of negative books that they must read can lead to a wish for something more fascinating. This can be taken a desire for detaining expressions, or words that stand out as well as draw interest. This could be seen as a way for the customer to break up the uniformity of checking out bad publications, as well as to find something that stands apart as well as is worth discussing. It is a suggestion of the problem of being an expert customer, and the requirement to find something to make the work more interesting.