Publishers have been concentrating on blockbusters for the last 20 years, that's why they're in the pickle they are where 94% of books don't make back their advances. They threw the midlist author under the bus years ago. They don't support non-brandnames with publicity or anything else. Penguin-Alpha couldn't/wouldn't get my Complete Idiot's Guide book into the chains with the result that 6 years later I still owe them $16,000.
Ebooks are new life for a lot of writers who've been shafted by mainstream publishing.