The quality gradients are actually tied to number of revisions/number of people who proofread the text. We'll put up more information about the way we proofread and how they relate to the different options for quality.
But yeah, if textlaundry can convey in that row of radio buttons (terminology?) that "great" service means that the text is worked on by more editors than work on text using the "good" service, that would be an improvement.