In the past two days I've read two different articles that speak to the nature of found art and photography This one" from the blog "Accidental Mysteries" describes the appeal as being linked to the collector's presence. Maybe these objects give people a certain measure of power over them. Another article, in print, in "The Outsider Magazine" suggested that the appeal lies in the fact that found art is devoid of any personality or input on the part of the artist, in a sense. Whatever what put into the piece is what's there for you to process.