I had a few pictures of a lovely little girl with hearing aid, and didn't want to sell it as RF. So I uploaded them to Alamy. They have had few views, and I didn't expect any sales before I could upload more pictures. But today, as my PicNiche-bar started updating, a sale popped up for Alamy: $71,17 for this picture:
It's going to be used in a textbook somewhere in the world.
The upload process on Alamy is tedious, but if I get more sales like this one, it will be worth it. :)