I know they call it optional, but if they are going to give a big speech about it and make you feel bad for giving less then I don't consider it truly optional. Actually on my last liveaboard to the Maldives the crew refused to accept anything less than the suggested amount (which was a reasonable $70) so it was really mandatory and not optional. I wish they would just make it a mandatory service charge and call it a day.
How could they refuse? How was the tip process handled?
We were to put our tip into a box and it would be distributed as per a formula that the crew had voted on.
How many days was your liveaboard in Maldives?