Spare a Rod and Spoil the Fishers

One allowance here buys 270,320 EXP, which places it 3rd of the 3 Lv 66 Carpenter tradecraft leves that record EXP. The best of them, Everybody's Heard about the 'Berd, returns 739,840 EXP for the same allowance, 174% more.

Across that rung the return runs from 270,320 EXP to 739,840 EXP per allowance — 3 distinct figures spanning 174%, so the wrong pick leaves 469,520 EXP of the allowance unspent.

On whether to wait: the best Lv 68 Carpenter tradecraft leve returns 556,350 EXP per allowance, 25% less 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 47% below its own category's average.

Gazelle Horn Fishing Rod ×1 is a Lv 66 Carpenter recipe, 3 steps deep through 3 intermediates, costing 18 units of raw material and 28 crystals.

Handing that in returns 15,018 EXP and 65 gil for every unit of raw material the order swallows, and the tree needs Blacksmith and Carpenter.

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 810,960 EXP and 3,516 gil for the 1 allowance it costs, or 810,960 EXP per allowance.