Yes, this can work. Same as Boss Cubes. - Never pillaged in ET, yet, tho.
I farmed 1 Skull Smasher, 2 Heart of Glory, 1 Regard Horn Staff, 1 Abdochar and im 1/3 with my Aspana Revoler with my Guildmates and myself as Corsair 3.
In average i would say it 1 pillage drop in 1000 kills.
Once we were super lucky and got 5 Pillage drop in 1 hour (This was in the time when Kugheri Lyoni had 500k+ HP, so we could kill ~600 Kugheri Lyoni per hour) -> This was crazy cuz 7 Horns in 1 hour was huge (2 with swelled DPK, 5 Pillage)