>'Firstly there is the issue of which particular cliff user has the greater right. Is it the traditional climber, the sports climber, the commercial operator, the educator, the youth worker/youth development?'
Specific to the retroing issues then the answer to this question is simple - the traditional climber as that was the style of the first ascent. Whatever made you think that your self-induced employment selection and need/want to support your lifestyle choices would take priority over that?
Also regarding ethics - if you're involved with teaching climbing shouldn't you also be instilling in your students the broader issues of climbing (ethics including not retroing, respecting the style of first ascent, not over cleaning etc)??? This will go a long way to them becoming better and more educated climbers - particularly if you're training them to also become instructors.