I work at a dive shop (evil empire chain). I do tell people what not to waste their money on. There are times when I give my recommendation, and it is just that a recommendation based on what I have found, what I have been told, and what I have seen in past experiences. We don't work on commission and even if we did I would still be honest with the customer, but then in my case I only work at the store because I think it is fun (I don't have to rely on the income from it to pay my bills). So much of dive gear has to do with the type of diving that will be done and personal preference that the customer really needs to be a smart consumer and do some homework for themselves. I never put pressure on customers to buy something, if they can find it cheaper I ask them to bring in a copy of the web page or ad and give me a chance to try and match or beat the price.