While many mutual funds have suffered net outflows during this gloomy market, the $372 million Prudent Bear Fund has pulled in net cash of $46.6 million this year as of June 30. The lure is plain: Prudent Bear can keep its entire portfolio in short positions if it chooses to. As a result, the fund, which currently has about half of its assets short, returned 58 percent through September 11, after a 7 percent gain in 2001.