It must be something of a Faustian bargain buying a Post-Impressionist painting for a record-breaking price. In 1987, Yasuo Goto, president of Yasuda Fire & Marine Insurance Co., bought Van Gogh's "Vase with Fifteen Sunflowers" (1888) for $39 million. Perhaps due to that daring purchase, his company, now merged in Sompo Japan, has ever since felt a strong obligation to maintain a high profile in the art world.