What's the cutoff, in your opinion (and others)?
I think there needs to be some reasonable judgement involved. I wouldn't put a time or distance rule into effect because so many variables have to be taken into account.
If the patient is having a complication of surgery, I think the best thing to do is take that pt. to the hospital the surgery was at. It is best for the patient.
If the patient is unstable, probably best to go to the closest facility that can help with the specific pathology.
If it will benefit the patient to go closer to family then they should go there.
If your system is extraordinarily busy, it may be best on a given day to take them to the closest and let the hospital sort the rest out.
I think the biggest issue in the case is recognizing what is best for the patient and doing it.
If they need/want to go somewhere outrageously far to your district, call them a private. Wait on scene till the private shows and then be on your merry way.
Unless the patient is truly about to die any minute according to reasonable and rational clinical judgement, not "what if..." Why does the 911 service have to transport? (aside from the billing, but that is the depatment's interest not the patient)
It is probably not a good idea to take the indigent people to the most expensive private facility because it is close. It just creates problems down the pipe, and while it is easy for EMS providers to claim that isn't thier problem, they probably wouldn't like it done to them. The same with people who have specific hospitals for their insurance.
It is foolish to think that system intergrity plays no role at all, but it doesn't always cause a complete breakdown to go out of your way in the interest of the patient to some degree.
Basically do all that is reasonably possible to help the patient. Don't just always do what is best for the providers.