I've been doing photography for our local horse community and also cars/motorsports. I feel the motorsports/cars is a lost cause. Unless you can edit and print at the track you can't make any money at it. The horse community here is very loyal and if you support them, they support you.
Just do what you love, post teaser pics and go from there. My best seller these days is selling an edited photo for $25 for the digital. I sell the pic full size edited and that allows them to develop it. But I have a disclaimer that says the photo cannot be used for commercial purposes.
Riddler
