Prosecutors said Inigo Philbrick, who admitted he duped investors who joined him in the purchase of blue-chip art, took advantage of the opacity of the art market.Prosecutors said Inigo Philbrick, who admitted he duped investors who joined him in the purchase of blue-chip art, took advantage of the opacity of the art market.Read MoreArt, Frauds and Swindling, Basquiat, Jean-Michel, Philbrick, Inigo, London (England)