SE, We need to talk about Leatherworker ...

[Ziggyzapps]

And that would be the balance factor I was referring to in execution.
But, if you look at the lower levels. E.g. Gagana Leather vs Koppranickel Nugget the effort difference is as glaring as my math you do not agree with says.

Koppranickel nuggets aren't the main ingredient to anything except 1 blacksmith craft, they are used to make koppranickel ingot which serves the same purpose as gagana leather. Base ingredients for weavers main mat at this level are 8 kudza vine, 4 cotton bolls, and 12 crystals more than gagana leather. Armorer has it pretty easy with their ingots but most of their recipes require 4 main ingredients and reisuis. Carpenter logs are very easy at this level though, but they are always easy for some reason.