I have seen studies that prove that $$ doesn't equate to more safety. It can however equate to lighter, more comfortable, better paint, materials, etc.
I am looking at the HJC RPHA MAX modular for my wife. It has a streamlined shell, well balanced and light.
It is true though that skill and situational awareness will help keep you out of harm's way. It is when the totally unpredictable happens that you will be thankful you have some gear on. Deer, Dogs, and Drunks are my major concerns when riding. My skill and situational awareness have reduced the other risks to a manageable level.