I just spent 1500 plat on the store crates from the past 2 limited sales and all I got was a useless mythic ring.

So this is an honest question to the Devs. Do you guys toggle the drop rates or are they fixed from the start?

Based on the past events it's nearly impossible to loot an arcane the first couple of days and then suddenly you guys increase the drop rates to encourage more people to continue to purchase plat. Also do the drop rates change in the crates?