Oh, I'm sorry, you mean you wanted an actual explanation? It's hard to tell when you are so busy trying to be clever and insulting in the same paragraph.
If you don't want to stay here, you are welcome to leave. But I'm pretty sure that even vampires don't have the necessary skills needed to survive in deep space. You are not forced to be here, the people who call this place home could simply have cast us all aside, left us to die. They chose to be hospitable, to provide food, shelter, and the opportunity for a job. If that isn't good enough for you, if you'd rather whine and complain, then I'm sure Groot or Cosmo would be happy to show you to the nearest exit.
So yes, in short, you should be. Be grateful to Cosmo and the crew of this ship for allowing you to stay. I didn't have a thing to do with it, I just happened to be the first person to pop through here and they took a liking to me and had a use for my training.