It's the same issue. If writers could meaningfully get an audience who buys their work independently, they wouldn't need a publisher.

Publishers offer support and printing, but ultimately an author needs a publisher to spread reach (i won't say "make money", because authors sure won't make much). Becsuse it's all about being loud and publishers have resources to be loud. Much better odds compared to a grassroots community paying a fair price when the author is ready to release.