You're dead right Remoak.
After 40+ years in the game I too feel I would like to do a bit towards helping and encouraging others if I could.
I personally knew a student who was investing plenty for a particular type endorsement (turbine, helicopter) and I offered to help for free and incorporate some useful mountain flying (I've done a bit) in that time.
I found the local training school did not want me anywhere near their operation because they wanted to keep the hours for their instructors. I also suspect that the instructors like to have their students look up to them as experienced aviators. Having old farts like me around doesn't help their image.
I've lost all interest now NZCAA made it all too hard anyway. Unfortunately I think the "blind leading the blind" will continue in the instructing game as long as personal gains and agendas outweighs any concerns CAA have about the standards of instructing.