To expand on lhoward's points, consider some of the basics in developing a large project: Specifications
Design
Implementation
Debugging
QA
Don't forget "Time". I think one of Perl's strongest points is the fact that solutions can be rapidly developed, programmed and implemented, which is critical in the business world.
I think if you can present Perl as a tool for the business world to stand alongside VB and java that you might have some luck.
I also think people tend to forget that agendas between management and their employers tend to differ slightly, and that if you present the problem and solution in their language, and discuss how it meets their requirements that you stand a better shot then if you were to 'get technical' or use an abundance of technically oriented facts and figures to back up your argument.