" Your shop" Discount % random?

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I only got 70% and 60% (on champs i dont even play) meanwhile some people have 30%. Is there a reason for this if not it's extremly unfair. NOTE: Kog skin for only 150rp was to cheap to let it go even if i dont play {{champion:96}} [](https://ibb.co/cXd1Xa)
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