Liberty Media Profit Rises on QVC  NEW YORK (Reuters) - Liberty Media Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=L.N target=/stocks/quickinfo/fullquote"&gt;L.N&lt;/A&gt; on Tuesday  posted an eight-fold gain in quarterly net profit following the  purchase of a majority stake in shopping network QVC and a  large gain on the sale of assets.