User blog comment:Xeinun/New maxed lvl weapon and armor/@comment-26908784-20171129095624

You are wasting your money

We can already tell what any weapon will do at max damage

commons/uncommons do 40% more damage at max, 4% each upgrade up to 10 times

rares do 60% more at max, 4% each upgrade up to 15 times

legendaries do 100%more at max, 5% each upgrade up to 20 times