The most profitable way would be to write, design, market, proofread, build the website and integrate payment etc etc yourself. I've been doing some research, a

The most profitable way would be to write, design, market, proofread, build the website and integrate payment etc etc yourself. I've been doing some research, and it seems that the average author is content with low (compared to the profit) royalties as long as they only have to deal with writing the damn thing. There are ebook markets out there but a lot of them are having trouble gaining momentum as a go-to location for books. This is a chicken and egg problem, and as more authors offer their books as ebooks, this will get better and hopefully a number of markets will emerge.