Okay, i found a blog by this woman artist who does a (small) painting a day. they are of mostly cutesy subjects but still pretty well rendered. She charges one hundred dollar per canvas. It looks like a lot of her work is selling. $36,500 minus the cost of supplies isn't so bad considering. It can't take her more than a few hours to complete each painting. The subjects are things like flowers, animals, and cakes. I like it.
My problem with sites like these is that people might be under the mistaken idea that a painting a day is something difficult. It really isn't. These types of painting aare most like excercises than huge undertakings. Plus, the more you paint the better you get at it.