I don't think you have to be arrogant to believe that people should pay you money to do things like tell stories.
I see it more as being supremely confident, but not "overbearing" or whatever. It's an exchange of goods/skills just like any profession.
I can see someone needing to be a bit arrogant to be a writer in a culture that thinks entertainment is useless, in the sense that stories aren't vital to one's daily sustenance, but in any culture that thrives on entertainment and information, storytellers are a vital part of the community. To *be* a community, stories must exist and be shared.
Is it just that an author has to think they're good enough to get published over all the other people trying to get published? How is that different from a person trying to get established in any other profession?
I think people should pay me very good money to help them fix their stories so that they are publishable, but I don't think that's arrogant. I believe that I should get hired as an editor, and that people who don't hire me are missing out, yet I continue to strive to improve my skills and make myself a better editor at the same time.
I don't get every job I apply for (though of course I think that I should get a job that I apply for--I wouldn't have applied if I didn't think I could do an excellent job), but I keep trying. I know that I'm good at what I do, and I know that if I keep trying I'll have success. But again, I think that's just confidence in myself and the effort I've put into my chosen field, not arrogance.
By the way, hi everyone! I've been gone lately because I got a new job.