From a hospital administrator standpoint, the "correct" profit margin is the most that can be extracted, and paying the radonc as little as market forces will allow is the correct way to accomplish this.
Now, one could argue (and I would) that this is short-sighted, and paying a little more (in the current market, given the intentional oversaturation of radonc supply by academia, that's all you would need) to get a good radonc will increase profit margin long-term. I would not expect to win that argument with administration, however, as their bonus structures are set to much tighter timelines than this kind of planning would allow.