Hate to break it to you, but those ARE the tier based discounts. Go to the link Morreion posted above… The prices have the same sharp drop at level 41 and large spike at level 77 as the flaks do, along with the bumps every 5 or 10 levels where the tier based discounts decrease. That means the tier-based discounts HAVE been applied.
I fully agree that pearl supply is absurdly low/costs are too high, but it’s not because tier-based discounts are missing. This needs a similar change to what they did with embers and ice/fire shards for 75+ to bring costs in line with “earnings”, unless PG thinks a second perch is a luxury that only the big spenders deserve.