You make an assertion that the heavy duty antibiotics cost 10-15x what they should? How do you know what they should cost?

    - How much money did it take to develop them? (Count the failures in your estimate)
    - What is the supply vs demand for them? (demand is probably low since you don't want to use these unless you really need to)
    - What's the shelf life for them. 
        - Do hospitals have to toss them if they don't get used? 
        - Do they have to keep them on hand or can they be Just In Time manufactured and delivered in an emergency?

As others have said here the real problem is lack of transparency into these issues. Speculating about what the cost of antibiotics should be only adds to the cloud of misinformation around medical billing.

I agree though that demanding more transparency is a good thing.