Dive shop trips cost considerably more than you can do it on your own. Considerably more.
The last shop trip I went on, I got to hear the owner expound on how he was heading to the in-room jacuzzi (which I and everyone got to pay for). Fine, but don't be an idiot and rub it in my face. There is a group of us who do "total trip cost divided by total divers". I don't need a shop supplied DM with less experience on my dime or paying for crap like that. YMMV
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