Why? What exactly does the XF script bring to their education (other than fulfilling a want)?
There are better places to spend that limited money than a "want" instead of the more justified needs,. Just because one may "want" to run a site on a paid script (for instant gratification) doesn't equate to one is "owed" that... there are plenty of open source ones available that can be migrated once one can afford to do so.