I've been playing in diamond with a lot of gold foil and alpha cards that get bonuses and have been getting less than 5 per win at around 90% ECR. So I'm not sure where you are getting your numbers from.
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These are rough math based on data matt gave us. Diamond and Champion rewards will get significant decrease the more players that reach those levels. Also after a recent bug fix the pools got depleted quickly and had to be fixed.