I've been getting quite a few queries lately from authors who inform me that they are previously published, but then they don't list their publisher. After a bit of research I then discover that the author was self-published. I'm now annoyed.
I have nothing against self-publishing, but I do not consider someone to be "published" if you've chosen this route. After all, if anyone can do it then why should I be impressed? The only way you'll impress me with a self-published book is if you have good sales figures. But the authors who write me these queries know this, or they would have told me who their publisher was in the first place!