If the Shoe Fits

One allowance here buys 559,130 EXP, which places it 3rd of the 3 Lv 68 Leatherworker tradecraft leves that record EXP. The best of them, Thick and Thin, returns 1,182,260 EXP for the same allowance, 111% more.

Across that rung the return runs from 559,130 EXP to 1,182,260 EXP per allowance — 3 distinct figures spanning 111%, so the wrong pick leaves 623,130 EXP of the allowance unspent.

On whether to wait: the best Lv 70 Leatherworker tradecraft leve returns 820,510 EXP per allowance, 31% less than the best on this rung, while the Lv 66 rung behind tops out at 739,840 EXP.

At Lv 68 this data holds 27 leves paying EXP across 2 categories: the 24 Tradecraft ones average 550,185 EXP per allowance, the 3 Fieldcraft ones 1,189,544 EXP, which puts this leve 2% above its own category's average.

Gazelleskin Boots of Casting ×1 is a Lv 68 Leatherworker recipe, 3 steps deep through 7 intermediates, costing 36 units of raw material and 46 crystals.

Handing that in returns 15,531 EXP and 35 gil for every unit of raw material the order swallows, and the tree needs Alchemist, Blacksmith, Leatherworker and Weaver.

The record carries a repeats value of 2. This site reads that as 2 further turn-ins on the same leve — an assumption, because the source data defines no meaning for the field — which would put the ceiling at 1,677,390 EXP and 3,786 gil for the 1 allowance it costs, or 1,677,390 EXP per allowance.