I now know, scientifically, according to this survey, why my paintings don't sell better.
Dia Center survey
survey results
I should be painting dishwasher sized landscapes, primarily blue, green and red in color, with wild animals, with people at leisure, that are pleasant to look at and that don't make people think about anything important, and they should cost less than $500.00 and be similar to the stye of Norman Rockwell or Rembrandt.
If I had know this 25 years ago I'd be rich by now.