different fishermen in answer to your question. Rod and line anglers would not appreciate such a permenant fixture and none of the diving organisations I know suggest to their members that they should leave anything permenant.
Your post would seem a little hypocritical - one minute you are berating people for leaving things that could damage your equipement and the next you are doing exactly that. I appreciate that you are highlighting main navigation channels but above a wreck is a 'main channel' for a drifting fishing boat.