Hefner, who founded Playboy in 1957, proposed to acquire the company at $5.50 a share in July. Miller believes Hefner is capable of paying $6.50 per share, which would be about a 24% premium over the current trading price of around $5.25. The $6.50 offer would be about a 7% premium over the stock's 52-week high of $6.10. Playboy shares are up about 1.75% to $5.25 today. Youku.com ( YOKU) shares are gaining more than 7.2% today. The China-based online video company debuted on the New York Stock Exchange on Dec. 8 with an initial public offering price of $12.80. The stock surged to its 52-week high of $50 on Dec. 10, in its third day of trading on the NYSE. Today, shares are up about 7.2% to around $34.95. -- Written by Theresa McCabe in Boston. >To contact the writer of this article, click here: Theresa McCabe. >To follow the writer on Twitter, go to @TheresaMcCabe. >To submit a news tip, send an email to: email@example.com.