There are definitely benefits to being hired on as a full time and permanent project manager. Job security, obviously, is one of them. Being able to really bond with your team as you move from project to project within a company is also great (provided you like everybody). At the same time, because of the nature of the work, finding a permanent/full time gig is rare. So what do you do in the meantime? Do you just allow a series of layoffs to hang out on your resume while you scour job boards and volunteer, living off of your severance pay or unemployment? This is certainly one approach.
Should You Go Freelance? Can Project Managers Make a Living That Way? | Project Management Tips || Project Management, Collaboration and Knowledge Management Blog