Tedious Work.

He had to tell them what kind of problem he was having and inform them to the best of his ability what level of danger would be waiting for them. if they came. The problem was that he didn't know exactly how powerful the enemies were. He couldn't provide a full picture, so many of the vampires rejected him quickly.

Some were willing to come over because of their pride, ignorance, or stupidity or because of greed. These were the four main reasons why the vampires who didn't reject him decided to negotiate with him.

The proud ones didn't want to admit that they were afraid of humans. The ignorant ones didn't know that there was anything to be afraid of. The stupid ones knew that they should be afraid, but they thought that they were strong enough and didn't need to be afraid.