WellPoint Health Profit Up on Premiums  CHICAGO (Reuters) - WellPoint Health Networks Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=WLP.N target=/stocks/quickinfo/fullquote"&gt;WLP.N&lt;/A&gt;,  the No. 2 health insurer by enrollment in the U.S., on Monday  posted a steep rise in quarterly profit as it kept health  premiums above rising medical costs and added new members.