Upgrade to Arena Crystals

Currently, there are three classifications of Arena Crystals.
Regular, Uncollected and Thronebreaker.
Instead of introducing Paragon arena crystals when the next rank comes out, what about providing higher tier players with a discount on the existing crystals? Thronebreakers would be able to buy Uncollected and Regular crystals at a discounted price, Paragons can buy Thronebreaker crystals at a discounted price, etc.
Regular, Uncollected and Thronebreaker.
Instead of introducing Paragon arena crystals when the next rank comes out, what about providing higher tier players with a discount on the existing crystals? Thronebreakers would be able to buy Uncollected and Regular crystals at a discounted price, Paragons can buy Thronebreaker crystals at a discounted price, etc.
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You would need to buy a lot of TB crystals to statistically notice the difference. I've opened 720 so far, and I don't think that is enough.
I switched from UC crystals to TB crystals (basically when they came out) in May of 2021. Since then I have opened 720 TB crystals. In those crystals I have seen 105 unit drops, 63 of the small ones (375 units) and 42 of the larger ones (1125 units).
That would be 14.6% of all drops. The stated drop rate for units is 15%. This is well within the margin for error for this volume of measured drops. You'd expect the measured drop rate to be 108 +- 10 most of the time if the drop rate was actually 15%, and 105 is well within the 98 to 118 expected range.
Has the rate changed over time? Well:
If it has, not by enough to be visible in the data.
Here's another look at the data: 720 TB crystals over two and a quarter years, with unit drops highlighted:
If you actually saw a drop rate of 5%, that sounds highly unusual but maybe not impossible. I've had batches of twenty with only one unit drop, and I had a stretch of 60 crystals with only four drops. But I've never had anything close to a stretch of a hundred crystals with only five drops. Across 720 TB crystals and 2200 UC crystals the worst stretch of a hundred crystals I can find is I think nine.