Not surprising--these are Florida and Caribbean plus the big worldwide outfits Aggressor and Dancer, all of which serve a very American clientele or, in the case of Aggressor and Dancer, at least a well-heeled and well-traveled international clientele that understands American-style tipping is expected by high-end liveaboards. But if one checks out the web sites of the hundreds of regional liveaboards in, say, Southeast Asia and the Red Sea, which serve a clientele from many more countries than the US, I suspect one will find that tipping/gratuities are not quite so emphasized. They typically just list a gratuity in the laundry list of what is "not included," along with Nitrox, alcohol, marine park fees, etc., and don't give any more detail. I don't mean to give the impression that I'm disputing anything that's been said, other than simply to voice my doubt as to just how worldwide and uniform the custom of tipping liveaboards really is. There was some implication or opinion earlier in this thread that tipping is expected everywhere in the world and that a typical tip is upwards of 10%. That's all.