Sea-saw
Location
Required Items
Rewards
What the allowance actually buys
One allowance here buys 625,040 EXP, the best of the 3 Lv 66 Blacksmith tradecraft leves that record EXP: the runner-up manages 512,790 EXP, 18% less.
Across that rung the return runs from 395,430 EXP to 625,040 EXP per allowance — 3 distinct figures spanning 58%, so the wrong pick leaves 229,610 EXP of the allowance unspent.
On whether to wait: the best Lv 68 Blacksmith tradecraft leve returns 806,710 EXP per allowance, 29% more than the best on this rung, while the Lv 64 rung behind tops out at 489,060 EXP.
At Lv 66 this data holds 27 leves paying EXP across 2 categories: the 24 Tradecraft ones average 510,818 EXP per allowance, the 3 Fieldcraft ones 1,156,384 EXP, which puts this leve 22% above its own category's average.
Doman Steel Saw ×1 is a Lv 66 Blacksmith recipe, 3 steps deep through 3 intermediates, costing 36 units of raw material and 45 crystals.
Handing that in returns 17,362 EXP and 90 gil for every unit of raw material the order swallows, and the tree needs Blacksmith and Carpenter.