I highly doubt there is any correlation between how much you spent and how good your hatch outcome is.
Here are my thoughts after whaling so much that I awakened 10 new myths in the last two months.
I actually will list the amounts spent and how many featured myth shards / other myth eggs I got from those. Then I will make a rough average gems/myths during this period.
This might be a little bit off but it can be a good example of a bigger data.
I would love for @Dev_VKC to pull my data from those last 2 months to show a real average gems to myth ratio from my account.
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Uraniumedhus banner (30packs): 1 featured shards (1x pity counter) + 1 standard pool mythic.
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Kirina banner (I must have dropped on her at least 20 packs while trying to awaken): 1 featured shard (+9 with tickets).
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Shi Na banner (57 packs): 4 featured shards (1x pity counter) + 1 standard pool mythic.
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Excaliburdragon banner (30 packs): 1 featured shard (1x pity counter) + 2 standard pool mythics (+9 with tickets).
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Isoldelle banner (33 packs): 3 featured shards (1x pity counter) + 3 standard pool mythics (+9 with tikets).
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Plume (0 packs): (+9 with tickets).
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Lemon banner (35 packs): 3 featured shards (1x pity counter) + 1 standard pool mythic.
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Luna banner (54 packs): 3 featured shards (1x pity counter) + 2 standard pool mythics.
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Rhinedragon banner (13 packs): 2 featured shards (+9 with tickets).
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Gorgodrake banner (12 packs): 2 featured shards.
Important note: I only counted the results on the banners that I wanted to push for (my 10 last awakened myths).
Results:
~285 packs total: 20 featured shards + 10 standard pool ones.
Which gives average of:
~14 packs for a copy of featured myth.
~10 packs for a copy of myth.
So it is almost identical to what you are supposed to get with a 0.75% chance for a featured copy and 1% chance for a mythic in general. I guess pity counter helps to maintain those odds in check.