Speaking as a professor and a former department head:
Grades are not a central part of teaching or learning. As a student, you know what you learned, independent of your grade. As a teacher I have a decent idea of what you do and don't understand, independent of your grade (at least in a small class). The grades exist mainly so that people other than you and me can evaluate how you did in a class.
For that reason, a policy of only giving one A, regardless of the performance of a set of students, is illogical and defeats the purpose of assigning grades at all. For the same reason, grade inflation erodes the usefulness of grades, though this is a little less serious because we all know that a GPA of 2.0 is no longer 'average'. Our interpretation of grades just tracks the inflation.
An instructor who gives all As or no As is presumably trying to make friends (all As) or make a statement (no As). Neither one is particularly helpful to someone who was not in the class but is trying to interpret a transcript. A good professor can make a statement in better ways than by simply refusing to give an A to the best students. And a good instructor does not need to buy good evaluations from students by inflating grades.
I think that you are not likely to influence your professor's policy without speaking to the department head, but I also think that you should speak to the professor first. (Depending on the person's personality... some people are vindictive, but most faculty should be willing to discuss and explain their standards.). If you make no headway, speak to the head. He/she will be probably be interested to know that grading policies are this far out of line with reasonable expectations, and will at a minimum discuss it with the professor. He/she might not change the policy, but will at least be forced to evaluate and explain the reasons for it.