I agree!!
* It is no one's business what I tip.
* I don't care what other people tip.
* No one should dictate what a tip should be. Tip what you feel is appropriate or can afford. The receiver will be appreciative whatever it is.
* For those seeking advice and asking what others tip - I personally tip $10-15 for a 2 tank dive (no matter the country I'm in) and have tipped more (a few dollars) - such as to the person who took care of storing and retrieving my gear on days I dove. More often than not, for me, it's $5/tank which also would be the same for a DM led shore dive.
* Although I have only had 10 different DMs leading dives in Cozumel, not one seemed interested in whether I, or anyone else tipped (although several Cozumel dive op websites indicate that tips are welcome.) I can only recall a few times anywhere I've been diving where it was suggested I tip, "Here's the tip bucket."
* From my tip, where it goes or how it is divided is not my concern. Don't care and don't feel my service has ever been diminished because of what I tipped on an earlier dive day.
* As a customer, my concern is diving and what the dive op offers, not what the needs of a dive staff member (DM, boat capt, etc) is - some suggest, they really need those tips - NOT MY CONCERN - if I felt I was getting slighted because of a lack of tip, I'd find another op.