Tigerman:
Lets do some easy math here..
6 divers on a boat, paying 80 USD for a 2-tank dive. Thats 480 USD.
6 divers on a boat, paying 20 USD each in tips (10 per tank). Thats another 120 USD.
That makes 600 USD.
Im pretty sure you can pay 3 people for working 3 hours each on 600 USD...
Now if that boat goes out on morning, afternoon and evening/night dives thats 1800 USD a day, 12600 USD a week and thats with only 6 divers on the boat..
$80 is a bit steep for Coz. Most consider $5 a tank a good tip.
But I think your MATH is missing a WHOLE bunch of stuff!
$960 for a day is GROSS. I know of very few boats that go out three times a day every day, maybe twice a week. Many do not go out twice a day every day. Try and find an afternoon dive on Sunday afternoon in Coz.
In any event at a Gross profit of $960 for an average six pack, now start subtracting. Boat, maintenance, gas, insurance, slip fees, staff salaries, advertising, computer expenses, air fills, equipment expenses, building lease costs, utilities, building maintenance, taxes, accounting fees, software, the list goes on. So what is left out of the $960? Impossible to say, but 25% would likely be optimistic.
Tigerman:
As I said before and wont hesitate to say again, its not called a TIP because its part of the BILL...
I've never had my TIP as part of the bill in the US, or Coz. In the US tips are expected because they don't pay staff squat, and so a tip is expected. In other places they just pad the costs 20%, and then no tip is required because they pay staff a reasonable rate. I think most bar tenders and wait staff in the US make around $3 an hour.
And yes, the tip IS optional, but I generally leave $5 per tank when diving, and between 15~20% for wait staff. Bartenders get less, but they do less. Pulling a beer out of a cooler, and opening it takes about 10 seconds, and that IMO does not deserve a 15% tip. I generally tip maybe a buck for a round, and that's plenty.