That depends on the author. But for what it's worth, Joe Konrath, the self-publishing advocate who wrote the original blog post, does pay for packaging assistance, and strongly recommends that others do likewise. (The right hand sidebar of his blog has links to his cover artist --- for ebooks, if you want the Amazon "buy this" page to look like anything --- and book interior designers. Editing is more of a mixed bag, but it's a very rare, and generally very experienced author whose work doesn't need a second set of eyes.)