Oprah Winfrey has bought into Weight Watchers in a big way, laying down is $43.2 million for a 10-percent stake. She joins the company’s board. Weight Watchers shares are up almost 75 percent in pre-market trading on word of the deal Winfrey has given the company the right to use her name, image, likeness and endorsement for the company, its programs, products and services, subject to her approval. She will also make personal appearances on the company’s behalf.