First came a bogus Bulgarian bid, today rumor had it that Oprah Winfrey was buying a stake in Avon Products. When tidbit hit the Street, Avon's shares jumped as much as 19%, now they're up about 6.5%. Unfortunately, for Avon's investors, the rumor was just that and nothing more, according to a Winfrey spokesperson.   The company, which declined to comment on the rumors, has seen shares plummet 60% in 2015, making investors eager for a white knight. Avon’s sales and profit ha...