The Spree was a giant costly ship. I've had 20 passenger day trip boats tell me it was just me & my buddy and they would still run. But we've always been able to 'bribe' additional customers by me bringing free hot lunch or for us to jump over (be placed on) to another local day boat.
I know how extremely expensive it is to run a dive boat charter and my 'GUILT FACTOR' just wouldn't allow me to 'enjoy' the trip. In addition since the deck crew usually works for just Tips, no way would it be practical to cover that much. If I see it's not the minimum passenger load, I'll immediately offer before the captain asks, to Transfer / Cancel / reschedule.
P.S. I have gone out on a 2 person charter because a dive shop booked half the seats (with healthy non-refundable) deposits or full pre-pay and then cancelled the day before hand. In that case, the boat chipped in for crew tips because it was free money.
I hadn’t even thought about the tip aspect. Unfortunately, our dates are not flexible due to flights and such. There are zero 7 day options departing our same date. There may be a couple of five day options we could get on, but I am hating the idea of making such a drastic change. I still don’t understand why they are not offering a discount. It would have to be better than taking the inevitable loss.