Depending on your perspective, the verdict delivered by art services and technology company Winston Artory Group was either very good or very bad. A print that had recently been appraised for $1 million was, the company determined earlier this month, now worth just $300,000—a 70 percent decline in possible value. These were happy tidings for the insurance company that requested the appraisal, and potentially devastating for the print’s owner. “The insurance company loved it,” says…

