Higher champion mastery levels/rewards?

Don't get me wrong, it is satisfying to reach rank 5 mastery, but I feel as if maybe 1 or 2 more levels could be squeezed in to really show that you main this specific champ, Maybe unlock a summoner icon of your champ that reaches maybe 50,000 or 100,000 mastery points. Most likely won't happen considering the hundreds of champs they would have to make icons for, but a guy can dream. What do you think?
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