Quero, you seem to be somewhat upset at Australian and other nationalities who don't tip the dive crew,
Upset? No, not at all. How silly of you to think that! Please don't try to read 'between the lines' in my posts and interpret my state of mind--I am very straightforward, and I've never called anyone 'cheap' or expressed any sort of disdain for those who choose not to tip, even if I feel that their arguments for deciding not to tip are flawed. My only objective is to suggest that people see beyond the haze of their own cultural biases. There is nothing that anybody can say about tipping here in this forum that would leave me upset. This is only the internet, after all.
but coming from a country where tipping is non-existent anywhere other than restaurants, I don't really think it can be attributed to everyone be 'cheap' (as another poster suggested) While in Thailand on our most recent trip, I did two dive days, one on a bigger boat off Phuket and one with a very small operation out of Railay. It wasn't until the second trip that I was told tipping is customary, because I asked the manager of the shop if it was appropriate. The DM was fantastic and I wasn't sure if it would be seen as being offensive. This may sound ridiculous but I know Thai people value the idea of 'saving face' and the last thing we wanted to do was imply that our DM was in need of our charity; as this is how attempting to tip an Astraliain DM could be viewed.
As I've said numerous times throughout the years in these recurrent threads on tipping, here in Thailand boat crews and dive staff never *expect* tips, but they always *appreciate* them and hope that at least some of the customers will express their thanks for making their dive experiences fun and trouble-free by way of a tip. If you feel good enough about your experience to actually say 'thank you' to the crew and the dive staff, you might consider leaving a tip to reinforce the sincerity of your words.
If you get mainly Aussie and Scandinavian customers, who all neglect to tip, perhaps a polite announcement to the boat what is expected could solve all the problems.
I don't actually think we have a 'problem' here. Some people tip, and some don't. This is the only expectation we have. On most boats, during the final disembarkation briefing of the trip the tour leader/head dive guide generally holds up the tip box and makes it clear that the money deposited in it is for the Thai boat crew and not for the dive staff. In other words, s/he advocates on behalf of the crew, but doesn't actually ask for tips for him/herself and the rest of the dive staff. Also, it's never put in such a way that there's an *expectation*, but merely an *invitation* to contribute to the tip fund.
As I said earlier, one thing that may mislead visitors in regard to tipping in Thailand is that at restaurants and hotels tipping is not customary. This is because in these establishments the addition of 10% as a service charge is mandatory. Because tourists don't see this tax, and in addition they learn that tipping is not customary in these establishments, they mistakenly make a blanket assumption that tipping is somehow inappropriate, when in fact they're actually giving 10% tips without even knowing it. As it happens, there is no such tax on tour services, so tipping is perfectly okay when it comes to tours (including dive tours), and tour workers do indeed hope for tips, though they would never anticipate seeing anything approaching the 10% that restaurant and hotel workers get. If you as a tourist don't tip, you won't 'lose face' because locals rather expect visitors to be somewhat clueless, and certainly, particular nationality groups get a reputation as militant non-tippers with expectations being adjusted when tour workers serve guests from these countries. (For example, yesterday I worked a charter with just seven family members from Spain who paid THB 42,000 for the day and left a tip of just THB 1000 for the crew who gave them a perfect day. That comes out to just over 2% as a tip.) On the other hand, if nobody on a boat full of guests of multiple nationalities tips, the crew may wonder what they did wrong to deserve such a put-down.