This reminds me of a job I recently did for a company that had duplicate Google Analytics tags. I removed one thinking I was helping only to be yelled at when their numbers were cut in half the following month.
After I explained that they were getting incorrect information I was told "I know this isn't exactly ethical ..." yada yada. I fired that client.
After I explained that they were getting incorrect information I was told "I know this isn't exactly ethical ..." yada yada. I fired that client.