Aloha all you bitter cheapskates,
This attitude problem of yours has had a negative affect on diving for many years. Before you get your board shorts in a bunch, let's look at the main market factor in diving for many vocal SB'ers;
price. Just like with certification, the trend is toward the operator with the lowest price. Quickie 3 day certs are what happens when most customers won't take the time or spend the money for thorough professional training, followed by advertising even lower class prices that don't include required materials, and then 100 dive paper instructors who don't have a family to feed or a mortgage.
Similar pressure for lowest priced boat trips has strained the ability of shops to retain competent crew. Look around folks, costs for everything are rising; fuel, food, operating permits, membership, insurance. Yet if a boat raises it's price hardly anybody goes with them. After years of nickel and dime-ing it's a wonder any good crew still works dive boats, so when you do run into them, show them your appreciation in a way that makes a difference, with some cash!
When I go on a dive boat, I expect the captain and crew to be working for my tip! By that I mean they should be going above and beyond trying to make my trip so good I will tip them big!
As a captain I could just head straight toward the site full throttle with gear bouncing and spray flying and any diver should be aware of sea conditions, or I could skillfully pilot the vessel in a safe and comfortable way to make the surface journey as enjoyable as possible.
As a DM I could just do the minimal duties or I could engage in pleasant conversation about diving and vacation activities, figuring out abilities, skills and desires to make suggestions and accommodations that will enhance both wet and dry times in my neighborhood.
As a guide I might find out what critters or activities you hope to see underwater and lead you to them or point them out when they happen. After the dive I might break out the books and better show you the unique animals we saw on our dive, or that you could see next time now that you know better what to look for.
The professional boat crew does not hold back on their skillful service, because the rewards from the compassionate, caring, understanding and appreciative guests makes up for the bozo's and moron's. But that does not mean we and our good patrons don't notice the bozo's and moron's who sponge off the system not paying their share!
When in Rome... one job as a dive traveler is to learn and follow the local customs. Do some investigation to find out if tipping is appropriate, and if it is budget accordingly, or sleep well with the fact that we all joke about the fact that your butt cheeks squeak when you walk!
If you can't afford the tip, don't do the trip!