3) Doctors who just want to get paaaaaaiiiiiiid (said with my best Flava Flave accent). It's a good way to make money if you have the support services you need to provide ancillary services (i.e. X-ray).
Most don't have ancillary services. They require their patients to bring an xray with them or have it done somewhere else.
The article I read had the two brothers charging $80-$85 per office visit. And they made 14 million. (not to mention the 40 million they made "somehow" they were busted trying to launder). So how much could docs possibly make? Out of $85 per visit, even if they made $50 per patient they would need to see 40 patients a day just to make it worth their time.