It is, however, smart to put resource limits on a shared printer so that no one user can cause it to burn through reams at a time. And even as expensive as ink is, the ingredients of a sandwich are more expensive than the ink and paper needed to print a typical document.

Additionally, we've been seeing more and more viruses attacking SCADA systems (most notably Stuxnet), which show that people have not been taking the security issues of robotics seriously enough.

In the traditional Unix network environment, printing and billing is a famously hard problem.