More generally, the job is not rewarding enough, through pay, satisfaction, location, etc.
This is all basic micro-economics of supply and demand. If demand for "good" Perl programmers is high and the supply low, "prices" (i.e. rewards) must rise. Alternatively, employers will need to find a substitute, either lower-quality programmers or switching their projects (if they can) to a language with a higher supply of programmers and thus lower costs.
(Which may not prevent them from miscalculating what is really lower cost over the long term -- paying a lot for good Perl programmers or paying very little for crappy programmers in language X. Economics says that people are rational -- but not that they are good at math.)
Code written by xdg and posted on PerlMonks is public domain. It is provided as is with no warranties, express or implied, of any kind. Posted code may not have been tested. Use of posted code is at your own risk.
<code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>