An Idea.
How about an E-book site that caters to new authors.
The new authors put up a "small" fee to get you to "publish" their book, and market it on your web site.
You get an up front fee + a small royalty from selling the E-book.
The author must take care of any other money, such as copyright...
This gives the author a chance to get their book out there without paying huge publishing fees and then trying to sell the book themselves. If they're good, then their name will become popular and they will sell even more books.
You can have featured titles, how many has been sold, new submissions, run specials...
You would probably have to keep the price of each book very low to generate an interest in new authors, but this would help your site in the long run, because most people don't like paying hardcover, and paperback prices for e-books.
You will have a lot of work and up front costs before you make any money. You'll have to advertise in the right places for authors to come to your site. Some sort of contract or agreement will have to be drawn up... you get the idea.
Another thought is the editing. You wouldn't want to put just anything up for sale, it would have to have been red lined and checked for content, sorted to the correct genre... I don't know if you would want to hire people to do this, or make the author pay for that too.
Anyway it's just an idea. Let me know what you think. Good and bad.