Have completed several gas stations I classify as "disgusting". Many are no longer the brand name shopped/audited. Thinking the brand gave the stations a choice -- shape up or no longer represent XXXX. Some even have shoppers go back to verify the branding has changed. It is amazing what some stations attempt, like using black spray paint over the 2 numbers in the center of the big orange logo that remains. I have seen those signs removed after being reported.
One thing I disliked about Maritz was a gas shop which asked "describe what you observed prior to revealing yourself." That experience might be good, bad, or a combination of both. Anytime I noted something even semi-negative, Martiz would ask me to change my response to 2-3 things "I liked". In this sense, the client was not getting objective feedback and may be under a completely different impression than reality.
While I have no proof, it seems some clients have a scoring tolerance. So if everything in the shop scored well except the sign (like hbbigdaddy mentions), that sign may sit unfixed until a score pushes the location over the intolerance threshold.