“It was a gamble when [Boston’s] Museum of Fine Arts decided to loan more than a dozen Monets to a Las Vegas casino gallery last year. Art critics and museum curators were not pleased, saying that it violated the mission of the nonprofit institution. But the MFA received a reported $1 million, and the show at the Bellagio Gallery of Art will draw about 450,000 people by its May 30 closing.” So naturally, the Bostonians will shortly be sending more works to Vegas for the casino’s next show, in exchange for a now-undisclosed amount of money.