From the Wall Street Journal article: Secret of Self-Publishing: Success
Self-publishing these days is increasingly a tale of two cities.
There are established authors, like Nyree Belleville, who says she’s earned half a million dollars in the past 18 months selling direct rather than through a publisher..
Then there are new authors, like Eve Yohalem. More than a month after self-publishing, she has grossed about $100 in sales— after incurring costs of $3,400. She said she’s in no rush, though.