I still don't get why you're so bothered. I don't mean offense, but it just sounds very OCDish.
---------- Post added 2011-05-24 at 04:06 PM ----------
No. People would not tip for disenchants at the end of an instance run. Nor would they often tip guild mates, as usually the enchanter would offer to do it for free.
No other profession gets its mats from the profession itsself (its either a different farming profession or looting stuff). Enchanting's produce is enchants.