Unlike the Michelin Guide, which has experienced food critics and reviewers checking out hotels and restaurants every year, gathering first hand impressions, dive agency QA is second hand information.
I have often wanted to write that "Michelin Guide" for dive stores.
On 5 Star ratings,I know of several stores that qualify for it, but refuse because of cost to benifit ratios .
I also know of 5 Star stores that have had accidents and extreme standards violations(unknown to the public) and still retain the 5 Star rating.
Ron