How do you like the idea:
http://www.publixo.com
It's the writers community, not a bookstore, so there's no royalties for publishing texts. But each text is automatically convertet to mBook. I use Polish version, because it's my mother language - there are much more mBooks than in the English one. The satisfaction from writing - there's all I need, not money.
And after this a long introduction I'd like to ask, what is more important for you: to have really many readers or to earn anything, even a few dollars?