Why do emotes cost rp?

Emotes is such a great way to improve communication in the game. Instead of having to type, gg, gj or nice job and risking getting attacked while typing Emotes can help you portray that message without having to lock you in a chatbox. But oh what do you know Riot makes em cost RP. and quite a lot too. Unbelievable. What do you guys think?
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