Why Does TT Give Significantly Reduced Mastery Points?

Occasionally, whenever I want to practice a champion or don't feel like playing a full 5v5, I'll play Twisted Treeline. But my question is why does that mode give about half the mastery points of Summoner's Rift? It's not like ARAM where it's a random champion in a single lane, so why the reduced points? Besides Riot wanting to make the other game modes less appealing than SR.
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