co-ordination unaffected
I can't believe that the phrasing of your question is entirely how you meant it to come across..... if it is, then it makes me utterly sad to think that people still think like that. I thought it was the old-school train of thought that chopping a trainee was good for the company, and your ego.
Seeing my trainee chopped would NOT be a way of boosting my ego.... in fact I think it would be the most demoralising thing ever, and also a reflection on my skills as an OJTI. Surely, it reflects better on you if your trainee improves steadily throughout their training to reach a standard where you'd be proud to say you'd trained them and would easily work alongside them. Sure, some trainees don't make it, but that's not through a want of trying to guide them and pass along your expertise to enable them to reach validation standard.
All that aside though, I'd like to think that people aren't validated just to ease workload on their colleagues. In fact, if a sub-standard trainee validates, does that not up your workload, as you're continuously monitoring them over your shoulder through fear of what may happen?!
Standard speeds The comment you make about differing remuneration... contentious indeed..... why should we be paid differing rates to train?? we're all undertaking exactly the same responsibility of allowing a trainee to work on our license and monitoring that person until such time as they are capable of undertaking duties on their own. As you say yourself, we all train with the same parity and fairness, shouldn't we then be paid with that same parity and fairness???