5F6B - as a 'user' of the Air Experience Flights for many years from the Air Cadet perspective (having experienced about 8 of the AEFs around the country over about 33 yrs), I maybe have a different take on it. All of the pilots I have ever met (well, nearly all!!) have been walking talking recruiting posters for the RAF, many of whom genuinely use all of their service experience to enthuse cadets about an RAF career. I believe that to be eligible for consideration as a pilot, they have to have been Combat Ready and have a minimum of 500 hrs total time with 300 hrs as PIC (I'm sure Beagle will be able to correct me on this!). I'm not sure that your average stude after BFJT on a holding posting will meet these criteria and certainly are unlikely have the presence / stature to be able to 'wow' the cadets.
These are genuine enthusiasts (such as former ACM Sir Michael Knight, who was re-ranked to Fg Off with 4 AEF at Exeter!).