Our latest poll links back to our wiki link - an article written by Mark Masnick who states: If Publishers Can't Cover Their Costs With $10 Ebooks, Then They Deserve To Go Out Of Business
The poll is based on a premise that if you have to charge more than US$10 per e-book as a publisher  (regardless of quality, quantity, popularity, how much work the author put into it and other contributing values) you shouldn’t be in the e-book publishing business.