OP here - you know; the guy who suggested triple turn ins are a trap...
I was looking at my inventory and realized I had several stacks of Millioncorn I had farmed to level Btn, with the intent of using them on the cornmeal triple turn in. I sold a few stacks because the price was just too good to pass up. Meanwhile I bought a few Mirror Apples that were very low priced and did the Apple Juice triple turn in. These are two of the triplers I LIKE because they only require one ingredient and one step... So I did some math to decide which is the better triple turn in to do:
Apple Juice requires: 6 Mirror Apple, 5 Fire Shards, and 4 Water Shards (this makes 1 aple juice, and you need 3 - so '3 batches')
Corn Meal requires: 3 Millioncorn, and 3 Fire Shards (this make 4 cornmeal, and you need 6 - so 1.5 'batches')
Current Prices on my server:
Mirror Apple: 40
Millioncorn: 87
Fire Shard: 18
Water Shard: 12
1 apple juice costs 6apples * 40gil + 5fireshards * 18gil + 4watershards * 12gil = 378. 3 apple juice costs 1,134 gil. 9 apple juice costs 3,402gil.
The reward for turning in 3 NQ apple juice is 32,049xp and 565gil. Do that 3 times for 96,147xp and 1,695gil.
Leve cost = 3,402gil material cost - 1,695gil reward = 1,707gil
96,147xp / 1,707gil = 56.325xp per gil cost.
4 cornmeal costs 3 Millioncorn * 87gil + 3 fireshards * 18gil = 315gil. 6 cornmeal costs 472.5gil. 18 cornmeal costs 1,417.5gil
The reward for turning in 6 NQ corn meal is 13,887xp and 152gil. Do that 3 times for 41,661xp and 456gil.
Leve cost = 1,417.5gil material cost - 456gil reward = 961.5gil
41,661xp / 456gil = 43.329xp per gil cost.
SOOOOOoooOO; apple juice is better XP for the cost of doing the leve - which means I'm going to sell my corn and buy apples! Plus, I'll get more xp for making the juice than I would for making corn in the first place.
This assumes NQ. If you make all HQ, you triple the gil and xp; the apple leve becomes profitable, and the corn leve earns a gaudy 2,524 xp/gil. At 56xp/gil, I may be willing to quick synth. Particularly since the Apple Juice cost is offset by the profits from leveling Btn with Millioncorn.