Why would I ever spend my blue essence?

Currently sitting on 28k blue essence. Why should I even consider wasting it for mastery tokens? I don't see the motivation for it. I rather hoard it and buy new champs or maybe there will be another blue essence store? Anything similar? Who knows? It's just too hard and too much work to get new essence because of the increasing exp per level. I really don't like this system. Feels too risky to waste it on tokens. How do you think about that?
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