It's also making a virtue of necessity. The 700 has a few issues for the role they bought it for - it's much shorter than the 800 so teaching cadets with no experience to land/fly the 800 innit is not ideal.
I understand it is also high on cycles, so 3600 cycles a year (600 cadets x6 landings a pop) is probably a bit beyond it so they're trying to get their money's worth out of it.