A Weighty Question
Location
Required Items
Rewards
What the allowance actually buys
One allowance here buys 79,510 EXP, the best on the Lv 40 Blacksmith tradecraft rung — matched exactly by 3 other leves of the 6 there, with the rest trailing at 47,700 EXP or less.
On whether to wait: the best Lv 45 Blacksmith tradecraft leve returns 137,400 EXP per allowance, 73% more than the best on this rung, while the Lv 35 rung behind tops out at 72,600 EXP.
At Lv 40 this data holds 52 leves paying EXP across 2 categories: the 48 Tradecraft ones average 72,545 EXP per allowance, the 4 Fieldcraft ones 560,212 EXP, which puts this leve 10% above its own category's average.
Mythril Sledgehammer ×1 is a Lv 41 Blacksmith recipe, 2 steps deep through 3 intermediates, costing 8 units of raw material and 19 crystals.
Handing that in returns 9,939 EXP and 72 gil for every unit of raw material the order swallows, and the tree needs Alchemist, Blacksmith and Carpenter.