One of the big benefits of getting a new controller each year was that it would let you keep your old robots running as demonstration machines. Perhaps since we are now expected to move our cRio from old robots to new ones, it would make sense to keep an old controller around to drop into your 2009 robot when you pull out the cRio for your 2010 machine.
It would also make sense, if you can, to keep one machine up and running for demos this year.
Otherwise consider that if you have controller from '04-'08 then you have enough for a "class set" if students work in groups of five or six. You probably also have enough speed controllers and motors and stuff for students to design a robot... there are a number of non-FRC competitions for which IFI controllers are ideally suited. Perhaps
http://botleague.net/
Jason