A Slippery Slope

One allowance here buys 495,740 EXP, which places it 3rd of the 3 Lv 72 Leatherworker tradecraft leves that record EXP. The best of them, Breeches of Trust, returns 826,240 EXP for the same allowance, 67% more.

Across that rung the return runs from 495,740 EXP to 826,240 EXP per allowance — 3 distinct figures spanning 67%, so the wrong pick leaves 330,500 EXP of the allowance unspent.

On whether to wait: the best Lv 74 Leatherworker tradecraft leve returns 937,250 EXP per allowance, 13% more than the best on this rung, while the Lv 70 rung behind tops out at 820,510 EXP.

At Lv 72 this data holds 27 leves paying EXP across 2 categories: the 24 Tradecraft ones average 590,811 EXP per allowance, the 3 Fieldcraft ones 1,405,338 EXP, which puts this leve 16% below its own category's average.

Gliderskin Boots of Casting ×1 is a Lv 73 Leatherworker recipe, 2 steps deep through 3 intermediates, costing 16 units of raw material and 28 crystals.

Handing that in returns 30,984 EXP and 92 gil for every unit of raw material the order swallows, and the tree needs Alchemist, 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 1,487,220 EXP and 4,431 gil for the 1 allowance it costs, or 1,487,220 EXP per allowance.