I'm guessing that Westlaw and Lexis pay for the support of those printers. They want to do anything to get you used to using them.
Everyone has heard about the Westlaw and Lexis points, right? You get points every week for using their systems to make searches which can be redeemd for free stuff. You are limited by the number of points you can earn each week or so, so you need to start early and keep up to rack up the points. Too bad their rewards sites are password protected. I've heard you can get things like iPods, bicycles, gift certificates, etc.