You’d never expect to fly to Aspen, only to be told to
come back tomorrow because the chairlifts weren’t operating
or because there weren’t enough customers. Or be told
the same thing at a golf course or a movie theatre. Nope,
no savvy business operator believes he must cover his costs
every day and if the next day doesn’t look good, just close
down - - even if if he has pre-paying customers.
Not so in diving. Not enough divers today? “I don’t
  care if you’ve spent the last 24 hours flying in from Jersey,
  the boat ain’t going anywhere. Take a hike instead.” So, this
  month our Thumbs Down award is for all those operations
  who kiss off the traveling diver, as Kohala Divers on the Big
  Island did in May.  
Michael Drumstas (South Grafton, MA), who had
  dived with them before and had a great time, writes: “I emailed
  the shop and made reservations for a Monday and
  Wednesday for my wife and me. Owner Rebekah Kauffman
  said that she penciled us in, we should give a call at our
  convenience to secure the reservation, and there was a 24-
  hour cancellation policy. So I assumed those two days were
  assured when I called. We dove on Monday, and had 50-minute
  limitations on our dives. Then on Tuesday at 2 p.m., I
  received a call from Rebekah that our Wednesday dives were
  probably not going to happen as we were the only divers, but
  if we wanted to ‘secure” that dive, we could pay for a third
  spot! Nowhere or at anytime was there a mention of a threediver
  minimum for the boat to go out. It turned out we were
  the only divers scheduled on the other days we were interested
  in diving. I called to voice my displeasure about having
  secured dive days cancelled without even a 24-hour notice,
  and that we would not risk this happening to our other dive
  days. Rebekah called me within minutes and was adamant about the boat not being able to go out with just two divers
without the third spot being paid for. All the while she kept
asking, ‘Are we all right with you?’ In the end, we did not go
out with Kohala on Wednesday, and we spent our other six
dive days with Mauna Lani Divers.”
We called Kaufman to get Kohala’s side of the story,
  and here’s her reply. “Every dive operation I know has a
  minimum required to make a trip, and most of our guests
  think three as a minimum is very reasonable to cover our
  hardworking crew and boat costs. When we are in the slow
  seasons, we do our best to accommodate divers but if for
  some reason we don’t have the required minimum, we
  call scheduled divers early in the day and give them other
  options. One option is buying the third space (they are certainly
  not pressured to do this), but many divers have been
  ecstatic to get a private dive boat at their disposal for such a
  low cost.”
In our book, a 2 p.m. call the day before is too late to
  assume you’ll have divers happy to pay for a ghost diver in
  order to go out. Most divers on vacation would be out enjoying
  the day and probably get back at dinnertime. Koala
  Divers could also reduce the disappointment factor by mentioning
  a three-diver minimum on its Web site. We checked
  the site in mid-July and nowhere was a diver minimum
  listed, although the 24-hour cancellation policy for guests
  to honor was mentioned twice. Apparently, that policy does
  not apply to the staff. So, my fellow divers, be aware if you
  reserve a space and only get “penciled in.” Looks like that
  really means “we’ll erase your name if we can’t make a profit
  that day.” Kohala may have saved a day’s worth of gas, but
  when they sent these pre-paid return guests packing, they lost
  12 more paid slots down the road - - and that’s just this year.