The AD/AP Mastery needs to be buffed

Seriously, at max rank its 10 AD and AP at level 18. 10 AT LEVEL 18!! Like wtf, there's not even a reason to get it. The lifesteal and spellvamp is so much better. At least make it like 10 flat AD and AP. Or even less flat, like 8, but 10 AD and AP doesn't even matter at level 18, let alone decimals of it early.