Nunh the Wiser
Location
Rewards
What the allowance actually buys
One allowance here buys 1,397 gil, the best of the 3 Lv 68 Botanist fieldcraft leves that record gil: the runner-up manages 1,270 gil, 9% less.
Across that rung the return runs from 890 gil to 1,397 gil per allowance — 3 distinct figures spanning 57%, so the wrong pick leaves 507 gil of the allowance unspent.
On whether to wait: the best Lv 70 Botanist fieldcraft leve returns 1,517 gil per allowance, 9% more than the best on this rung, while the Lv 66 rung behind tops out at 1,387 gil.
At Lv 68 this data holds 33 leves paying gil across 2 categories: the 9 Fieldcraft ones average 1,176 gil per allowance, the 24 Tradecraft ones 2,383 gil, which puts this leve 19% above its own category's average.
Ala Ghiri, The Peaks issues 8 leves in this dataset, Lv 60 through Lv 68, across 3 disciplines.