I see so many people on LFG saying they have an offering, but I've never seen anybody specify what it is their offering summons. What if people out there are trying to do the bounties? They need Captains and shanks, they couldn't care less about servitors, vandals, and dregs, and hate it when they get something that's not the one they need. You can easily find out what your offering summons by looking at its description in your inventory, it will tell you what enemy it's for, and you should then give this info to the people you're trying to persuade to join you.