From the beginning, I liked the impact measure (aka: people helped), but I must to admit that my personal case is pretty much inexact. A shadow grows between the datetime of the question and my answers. My impact measure take in account views made before that I answered.
My SO profile show ~405k of impact, but my linear estimation is less of ~140k.
Here are two examples:
Question: 1401 days from Q - 115k total views
Answer: 253 days from A - 20k estimated views (linear estimated)
Difference: 95k views
Total difference: ~405k - 95k - 170k = ~140k
So late answer should not be taken into account, or we need some kind of function to adjust this measure.
What do you think?
Personally I won't lie to my grandma.