As a case manager in an ER and in close contact with my hospital's CFO, we definitely do not promote admissions that are not medically necessary. They are bad in the long run for hospitals. Part of my job is to see how they can be safely discharged home or back to the nursing home. Reducing the readmission rate is also of high priority.
If a patient does not meet at least observation under Interqual guidelines, I'm definitely talking with the doctor to see if something more needs to be documented, see if I missed something pertinent, or if something additional needs to be ordered to meet the intensity of service.
That being said, there is on occasion, social cases where we need to keep the patient for their safety but they may not have anything medically wrong.