Invaluable , the world’s leading online marketplace for fine art, antiques and collectibles, today announced that the company delivered strong auction revenue results in 2016 despite a challenging worldwide auction market, and added more than 750 new auction houses and art galleries to its marketplace. Rob Weisberg, CEO of Invaluable, said, ‘Our 2016 auction revenue grew 30 percent year-over-year and buyers on our marketplace grew by more than 14 percent.