What you were expecting to happen, and what actually happened:
I was expecting to gain event points based on battle rarity/level. This doesn’t seem to be entirely the case, there’s either a large random factor involved or the skull tables are flawed. Picking “Sol’Zara’s Shamans” eight times in sequence, my battles looked like this:
Level 10: 2 skulls
Level 20: 2 skulls
Level 30: 2 skulls
Level 30 (again, shouldn’t this have been 40?): 3 skulls
Level 50 (no level 40 for me): 3 skulls
Level 60: 8 skulls
Level 70: 5 skulls
Level 80: 7 skulls
Things to note:
I received the level 30 battle twice, skipping any level 40 battle that might have been available
I gained an unusually high number of skulls for the level 60 battle
Other battles also seem to have inconsistent rewards. Among others, I received two distinct level 10 mythic battles (one against Shade of Zorn, the other against Gargantaur?), one was worth 6 skulls, the other one 4 skulls.
Seems this event is way harder (if possible) to get all rewards. Even in my guild, where we used to get all rewards during first days. Though we’l have to see yet.
There’s variation in how many skulls you will earn from each battle but on average you will earn more as you fight higher rarity/level battles in Council of Chiefs.
One player received a 30% higher score than another player, for roughly the same very high number of fights. For all pratical purposes this is completely random scoring, players have zero control over how well they fare.
This suggests a correlation between level and score, the higher your level, the less skulls gained on average. Which I believe would not go down well with the vast majority of players if it turned out to be true and once again accidentally failed to make it into the patch notes.
I’d strongly recommend raising this issue with whoever is calling the shots these days, as soon as possible. This isn’t a minor flaw, this has all the potential to escalate into your next shit storm.