Look at posts 13 and 14. What you see there is essentially what the workshop I attended told us to do. Here are some quick summaries of what we were told to do:
1. Rental regulators should come without mouthpieces because of a concern for your health. Students have to buy their own so they will be safe from deadly germs.
2. Get equipment before class, saying the cost is fully refundable. If the student has second thoughts after the first pool session, explain that "fully refundable" means "not used." The second you get in the water for CW #1, it is used.
3. Throw away the mask straps that come with the masks you sell so that they have to purchase a mask strap from you. Do the same with the mask cases.
4. We were given several sales pitches to use to get them to buy gear before the confined water sessions begin and absolutely by the time the open water classes begin.
5. We were told to call key equipment by a set of names not used normally in the scuba industry. Why? Almost all new students know nothing about scuba, and you are the first "experts" they have talked to. They will think that those names are the norms. If they decide to shop around and the next place they visit doesn't know what they are talking about and is using weird terms like "regulator," it will seem to the student that the second shop doesn't know much about scuba.
6. Make the student/customer feel as if you are just plain doing everything you can to help them, that you are cutting them one break after another after another, when you really aren't doing anything of the sort. That way if they show up having bought something at another shop or online, you can lay a real guilt trip on them about how they betrayed you after you made all those sacrifices for them.
7. In general, talk about the key safety issues related to the equipment, and make sure the customer feels like anyone who is willing to trust his life to anything but the best--especially for his family--is a cheap SOB willing to risk people's lives to save a buck.
8. Identify a package of gear--specific regulators, BCDs, computers, etc.--that will bring in the top profit margin. Push everyone to those specific items, regardless of need. If you sell a high number of specific items, the manufacturers will usually sell you them at a discount in the future, thus increasing sale margins.
9. Require your instructors to purchase those items identified in #8 and wear all of them while instructing as their "instructor uniform." Require them to tell the students that as instructors, they have the freedom to buy anything, but they want the best. They therefore carefully selected every item they use while instructing because it is the best there is. (The only item on our required uniform list I would purchase and use for myself was the wet suit. I would have been required, for example, to say that I use a specific brand of alternate air source on the inflator hose because it's the best way to dive, even though I personally would never buy one if given the choice)
If you think all of those tactics are part of a salesperson helping to meet the needs of a customer, then you and I have a different vision of business ethics.
If you think a customer who feels duped after that is just having buyer's remorse, then you and I have a different vision of business ethics.
If you think a brand new student who doesn't even know anything at all about scuba needs to buy a rebreather before the very first CW class (because it's the best, and you only want the best, right?), then you and I have a different vision of business ethics.