Would not be surprised to see an increase in nut drops in a patch for 1.21a/b/c
To be fair SE knows how to do the basic math on the ifrit/moogle drop rates. They know what it takes to get all drops/your desired drop. If they made the loot system exchangable/tradable inside the instance they would have just nerfed the drop rates. They want you to do 200~225 runs to get all the 7 weapons. 180 runs was the 50% rate for being 7/7 (ex on avg half the population will be 7/7 after 180 successful runs).