I was talking yesterday with a fried of mine who has recently hooked up with an agent who will book him for speaking engagements. And we were talking about work and publishing and he was saying, basically, that in general, and with the agent in particular, if someone sees you out promoting yourself, that makes you more attractive to them because they know that you will help them with their work. This was, of course, in the context of publishing books and my promoting my own business.
The way he framed it was very good for me, because I am not enthusiastic about self-promotion. I want my merits to be recognized by for themselves. This is, I know, naive--there is plenty of merit out there, and the question of whose attention you catch is important.
Writers who lose confidence in their own merits often can become blocked--especially when asked to promote themselves or their own ideas.
Believe in your writing!
(And if you're having trouble believing in your writing, you should contact me because I'm excellent at helping people with that problem! <- that's self-promotion right there.)