It would be nice if the corns would rarely put out a plucked turkey, as was hinted at back when they were still spawning - after all, the Harvester's blade is a powerful harvesting tool - especially in the hands of a human.
Here's a refresher on how they work.
Elves and Gargoyles get the base amount of leather, scales, etc.
Humans get at least 10% more (it's 110%, rounded up, so that if a creature gives 12 leather normally, the human gets 14 (12 + (1.2, rounded up to 2)). This only applies to leather.
If using a Butcher's War Cleaver, the amount of hides becomes cut leather put into the backpack, but there's no increase over the racial amounts. (the skinning knife works the same, but is required to be wielded)
With the Harvester's blade, it bumps up the return on cut leather, Feathers, Scales, meat types, and dragon blood - all of which is moved to the pack of the character.
For Elves and Gargoyles, this increases the cut leather amount to the Human level (plus the 10%+ also applies to the other items).
For Humans, the human bonus is applied, THEN effectively applied again. So, if a human used it to carve a slith (10 leather, type dependent on slith species)
Base of 10 leather
Raised to 11 leather by Human bonus
Raised to 13 (11 + 10% rounded up (1.1 rounds up to 2)) with Harvester's blade.
As a result, anything that gives 10 leather, returns the optimum amount (an effective 30% bonus!), when a harvester blade used. 11 Leather would be even better (36% more), but AFAIK nothing gives 11 leather when cut with a normal tool by an elf/gargoyle/pre-ML human.
One of the issues with manipulating these is that the person who designed the Turkey event now works as a member of EVE Online's community staff, not for Mythic. It's unfortunately also why we didn't get the much superior map location system from that event instead of the craptastic recent revision of Treasure Hunting, as she did most of the game design work on her own time, not paid by EA.
I really wish they would start dropping the plucked Turkeys, even if at the same rate (1/25000) as the moonstone jewelry on Gypsies.