Listening to music makes a good therapeutic activity for both the stressed and the depressed. While it does not incur the listener much costs probably except for electricity used, the listener, upon listening to the kind of music that he/she desires, gets a lot off it--peace, comfort, and satisfaction.
The same can most probably be said about making art, which has shown itself as a very good therapeutic hobby and activity not only for the stressed and the depressed, but also for those who are disabled.
Somehow, and I do not know what is a probable explanation for this, those who are physically and/or mentally disabled tend to have greater talents in the arts. I recently found out that this is called Savant syndrome, which is not exactly a medical diagnosis but a generalization made out of thousands of anecdotal observations.
If this kind of phenomenon is, indeed, true, then their talents in the arts also make a good way to make a living. If I had that kind of sheer talent in the arts, I wouldn't hesitate to use it and make living a little more comfortable for myself. For some other people, the income derived from this work is already good enough to feed for an entire year. People with disabilities are almost always rejected when applying for jobs. Their talents in the arts are sometimes their only way to make a living.
Thus, networks like Disabled Artist Network have come to exist and serve the disabled artists' population. This particular network's aim is to serve as a medium by which the disabled artists may be able to sell their works in the global marketplace and also to serve as a venue through which the same artists can get to know other people in their field. It's a noble cause worth commending and promoting to your friends who are interested in art.
So the next time you want to purchase a piece of art, do not forget to drop by the websites of these networks. They might as well hold some of the works that you will come to like.