Also, lots people demand antibiotics which aren't necessary as part of their treatment. On the other side, I've been prescribed antibiotics that I knew weren't necessary (and never filled or took) from doctors who are either incompetent or want to take the easy way out.
Same thing happens when I finally go to the doctor for a cough, first an unnecessary x-ray and then sugar syrup (which is garbage treating a cough from a cold ). As Brit says, they make money off it and especially if you have insurance