You are right, I probably shouldn't have included vanity/self-publishing/etc. in the question since I am primarily interested in the answer as it pertains to electronic publishers and legitimate-but-limited small presses. But, having hung out at Absolute Write for a while, I know there are a lot of authors who got taken in by Publish America and similar scams/companies and figured the answer might pertain as much to them.
(When I say legitimate-but-limited small presses I mean those without distribution channels in place other than Ingram and Taylor or similar companies that are more of a warehouse than a distributor. There are certainly some small presses that have legitimate distribution, get the book into stores and not just on a list the store special order from, and count as legitimate publishing credits.)
(When I say legitimate-but-limited small presses I mean those without distribution channels in place other than Ingram and Taylor or similar companies that are more of a warehouse than a distributor. There are certainly some small presses that have legitimate distribution, get the book into stores and not just on a list the store special order from, and count as legitimate publishing credits.)