There's more important things in life than making money. Enjoying what you're working at is one of them.
There are many jobs on the server side which make use of perl. Especially the unix server side. In big and small companies.
If you like unix, I would recommend learning the big three: C, shell (ksh/bash/zsh/etc), and a "scripting" language (perl/python/ruby/etc). Each of the three is a critical component which supplements and cooperates with the others.
My own preference in "scripting" languages is perl, which, although not as clean as ruby, has many advantages, such as being ubiquitous on unix servers, just like vi is.
You can learn java, php, javascript, etc. if you're interested in web programming. But if you're not interested, there are other paths you can take.