Interesting topic. As someone who is pursuing licensure, I'm doing it for a few reasons:
1 - Allows for more flexibility (can freelance or start my own firm if I desire)
2 - Generally makes you more attractive to employers
3 - Once you pass, the continuing ed requirements are reasonable
4 - Getting a license seems to be "industry standard" although I'm sure there are exceptions.
On top of my reasons, the only advice I can offer is how will it help further your career? If you have a stable job, don't need to be licensed, and don't want to pay for it, then maybe it's not necessary. But you can't be positive you'll be in the same position forever. Things change. Having a license is a way to give yourself some stability/credibility in the field in addition to your experience. Is having experience more important than licensure? Probably, but that doesn't mean it's worth nothing. There may be opportunities in the future that require licensure that you would be unable to pursue because you need someone else to stamp your drawings.