Comment by BrenBarn

People do do that in some limited cases, but it's often impractical. Two common cases are a) there is a need for urgent/emergency care; or b) the patient is generally frail and infirm. In these cases it can be impossible or impractical to arrange for treatment outside the US. That's leaving aside the logistical difficulty of arranging it (plus the costs for travel, etc. associated with carrying out the plan).