Anyone in any industry that "overservices" eg roofing plumbers, termite inspectors, dentists, car mechanics and the list goes on and on.
Overservicing is the biggest rort going in my opinion.
My wife was working at Cedars-Sinai Hospital in Beverly Hills two years ago at the time when one of their leading surgeons, and a coupla others, were given 10 years' jail for ordering unnecessary colonoscopy procedures left right and centre on their patients - overservicing.