I would say yes. Systems administrators can also use vagrant for testing our own environments. Say you want to test your puppet manifests against a known standard configuration - you could `vagrant up` an entire testing system environment.

Additionally, part of a systems administrators job is supporting the systems that the staff use. Vagrant still falls within this scope.

So a blanket ban on vagrant is not a good idea. As with most things, looking at the question in-context before making a decisions is the way to go.