Premium hero crystals and other crystals

Hi,
Im wondering since im playing this game that why premium hero crystals always giving me 2 star champ & never i got 4 star champ while other players are getting more than 5 times a month 4 star hero from this crystals.
Also, from todays special crystal, given by administrator, i got 2 star champ while most friends within our alliance tgey got 4 star champ.
Is there something special ways of playing for getting high stars champ which i dont know or not?
In my alliance they are also new players as like me, playing since last couple of monthes.

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