Which one? This one - which is a Tier 2, or the previous one?
Is your post about this event, or the last one?
In one of my other posts, I have already shown the tiers required for campaign 2 overall to be below campaign 1. Even with the singular Tier 4, the overall cost ends up below campaign 1 (I stand to be corrected).
I think you’re riding a hyperbole, there is no event that requires multiple tier 7 purchases.
I’m not saying the planning is faultless, or even done by very capable people (I don’t claim otherwise either), but some one/team does go through the motions of setting reward thresholds that are different every week. And my point is that (I fully believe) this process is based on Pharos-Ra giving out Sarcophagi not Seals.
To rephrase, my point is that the only error here is a misprint, it’s a tiny molehill.