That’s actually an extremely attractive proposition to work in a Perl shop. It’s the same deal as Lisp or Haskell or Erlang shops: you know you’ll be surrounded by top notch talent!
I understand your angle but the reason is not in the language's technicality but in the community and its culture. Most Perl speakers are seasoned hackers who are great at low level programming and use Perl when C was an overkill; their documentation skills are also noteworthy. Just my observation; I've read Perl docs (just type ('perldoc perltoc') if you're on a non-Windows box) and giggled at some of the funny remarks and admired pithy writing.