I love these tipping threads. Pure economic arguments, not always based on reality, but fun nonetheless. We spent some time with a Socorro Island live-a-board crew after the trip. A dinner in Cabo. They were paid less than $70 per day...don't want to "out" them by being specific. They served meals, cleaned, lugged our stuff on and off the panga's multiple times a day, led great dives and were all around amazing. They told us that a particular nationality group never tips, so, on those trips they earn less that $500 total for an 8 day trip. I will tip 10% until the cost exceed $3500, then it is dollars not percentages. These guys and management told us in casual chats that for a $3500 trip, if they earn between $200 to $350 per person in tips they are very happy. Next live-aboard is very expensive, if my spouse and I did 10% it would be over $1,100 for the two of us. I'm thinking, for two, in the $800-$900 range. It's all personal choice, but as a former waiter and bartender through college and law school, I'm biased to do as much as I can.
Rob