What Jax meant, if I may:
The SS Minnow has a capacity of 18 guests. Joe's family would like to take the last 4 berths, but they only have $10k in the liveaboard portion of their travel budget, the balance carefully budgeted for planes, taxis, dog-sitters, etc. The SS Minnow charges $2400 per person. Would the crew like to have Joe's family fill the last 4 berths, and collect the $400 left in their budget for a tip, or would they rather have a little less workload?
I think we already have your answer, Wookie.
That is really a different scenario, and I'll tell you why.
Since sometime in maybe September, 2008 the entire travel industry changed. Obviously it changed with the economy, but let me go a little further. Everyone's budget, especially for leisure travel like liveaboards is stretched to (and past) the max. So are the company budgets. For instance, Joe puts in for vacation in January for his family's liveaboard trip. They have carefully budgeted and (as you say) have $400 left over for the tip. No sweat, we welcome them anyway. The vacation is approved, and they have the tickets, the dog sitter, etc. On Friday of the weekend they depart, Joe's boss says "Joe, I need you to work on the Harrison account next week and it needs to be done by COB Thursday". Joe gleefully says that he has vacation arranged and it was approved back in January. Can't Smith work on the Harrison account, and Joe will be available by Sat Phone if you need him. Boss tells Joe that if he likes his job he'll have the Harrison account on his desk by COB Thursday or he can go on his vacation and spend the remainder of the afternoon packing his desk.
Joe is going to miss the boat. You'd be surprised how many times per week this happens. Used to be that the company would make the vacation good, but with corporations being people now, they are in the driver's seat for employees, so Joe is SOL. Joe has learned to not schedule his vacation until the very last minute. If you looked at my calendar, you'd see that there are 5 spots available for the next weekend tip. That trip will sell out, and it will sell out the day of departure, when everyone has looked at the weather report, made sure that the lawn is mowed, honeydo's are done, and gas isn't $6 per gallon.
So, 30 days out when Joe has a van wreck, I'm happy to refund his money because I'm very likely to resell his spots. Hotels.com and Aggressor Fleet are teaching folks to book last minute by offering specials. So, in your case, Vladimir, I'm happy to have Joe and his family who have budgeted $400 in tips, because, as I said way earlier in the thread, we like tips, but don't expect them. It really is apples and oranges compared to Jax's scenario.
By the way, Joe's family (of 4, mom, dad, 2 teenagers) almost exclusively tip $400. Every time. Regardless of the price of the trip.