Yes, it's not everything.....but it does have a place in the scheme of things.
Yup, it sells ammo. I've been fighting with the establishment and conventional wisdom over the lack of terminal goodness (this is a technical term) produced by the revolvers I hunt with very publicly over articles, etc. It may be a useful tool when comparing one load to another, or it might not. A .22-250 generates (actually calculates) more energy than my .500 JRH buffalo loads yet there is no denying which is better for a large bovine.
Clearly you will not be using a BB gun or a .22 on Cape buffalo...