Makes so much more sense than an average. Doing this fosters the mindset that you enter a class to LEARN. You may not know much when you enter, but you will learn a lot, and then you have new knowledge and understanding at the end. Why should the beginning states of not-knowing influence your grade at the end. Should you not be evaluated, at the end, on your new, current knowledge and understandings — how you are a reader/mathematician/scientist NOW.