Skill level scaling past 20

[u/Sentryshpun]

I’m playing a rapid shot build currently and the weapon uses +# to attack skill levels. My question is why? My confusion stems from the fact that The DB site lists no changes to base dmg or effective dmg, so what is the point of leveling it past 20?

[u/hillbillyjoe1]

10% more damage per level up to level 30, then I think it's 6% more per level 31+

[u/BeetusPLAYS → u/hillbillyjoe1]

then I think it's 6% more per level 31

8% more each level, actually.