Terrain Safe - you should also have consideration for those who have been sat around since January 2001 at Nerc doing the feed positions for no extra, or actually, LESS reward. People are always going to be affected by such problems, but would you decide against action because of it if you eventually become an OJTi??
Roger Out - those at the top of the scale are handing in their training bags as they get NO extra pay for it. OJTI's are awarded the next rung on the pay scale ladder, so once your at the top, there's no more to be had. Don't know if its permitted to just 'jack it in' whenever you like as we are all contracted to be trainers, like it or not.