Champion Mastery Points Should Increase Damage Dealt

Ever since the introduction of mastery points, they haven't served much of a purpose other than bragging rights and flashy emotes. However, I suggest a change that would cause mastery points to be more relevant in terms of actually effecting gameplay. Now, I don't know what the exact numbers would be, but here's what I suggest.

For every 5000 mastery points on the champion you're playing, you deal 1% increased damage. This wouldn't be too game breaking but would provide a nice benefit for those who play the same champion often. To put the number into perspective, for every 100k mastery points on a champion, you would deal 20% increased damage.