When I was diving in Philippines last year the Dive operator had a box in which you could tip the Filipino dive crew, as for the DMs and instructors I was always ready to buy them a drink or three in the bar later. Not really sure what the salary differences are though.
In Aqaba, I bought about three bottles of rum to share for the week I was there and paid for a couple of meals with one of the instructors, but did not pay any cash to anyone.
Locally in UAE I usually give the boat guy a few $ every trip, I know his salary is crap, and he is really helpful carrying spare tanks etc., so I have no hesitation in tipping when that is the case.
In Aqaba, I bought about three bottles of rum to share for the week I was there and paid for a couple of meals with one of the instructors, but did not pay any cash to anyone.
Locally in UAE I usually give the boat guy a few $ every trip, I know his salary is crap, and he is really helpful carrying spare tanks etc., so I have no hesitation in tipping when that is the case.