Because 3 stars and 4 stars are of a higher tier than 2 stars. Although toward the lower levels they are roughly the same, e.g A rank 2, 4 star champion is the same as a rank 4, 3 star. Because the potential of higher tiered champions is so much greater, they are rarer. Otherwise the game would be too easy and there would be no learning curve, no challenge and no effort needed to collect a good roster.
After a while you can grind around 4-5 PHC per day average from arena+events+quests, it wouldn't make much senseif you could find one or two 4* per day
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