Thieves who steal artwork receive between 1 to 2 percent of the ultimate black market sale price of the stolen piece.
See all of our information and threat intelligence on Art Theft here.
Also, see other profits from black market crimes.
Source: Robert Wittman, Priceless: How I Went Undercover to Rescue the World’s Stolen Treasures, (Crown, New York. 2010), page 82-83.