The first shop I used when I got certified seemed ok. Then the nickel and diming started. You need this or that. Still I became a DM through that shop. One year Oceanic had a deal on the CDX5 with GT3 second stage. Dealer cost 125.00. MAP for this sale was 280 or so. I was starting to get interested in diving doubles so I wanted the owner to get me one. I had just spent a week of evenings a month before getting the new store location stocked and sorted. On top of actually finding the location so he could move out of the storage unit/garage, he was in. I had been helping with classes, shlepping tanks, and since we were opening on Black Friday that year, I went in and opened the place up at 7 am. Did about $500 worth of sales before he arrived at 10.
So he ordered the reg. I was expecting some kind of a discount off MAP based on what I'd been doing. He gave me one. Charged me 275.00. That was the last piece of gear I bought from him and started buying from Scubatoys, LeisurePro, and TDL.
Along with the reg issue he tried to tell me I did not need a BPW, long hose, or pony bottle. Because he didn't sell what I wanted.
Would not even order them for me. I went direct to Deep Sea Supply and bought two BPW rigs. One for singles and one for doubles. Pony bottle and reg - Scubatoys.
The next season I left that shop after too much of that and seeing the way others were getting taken advantage of.
Now, when I have someone assisting me with classes on a regular basis, if I want them in the gear I sell I don't charge them MAP. I give it to them. Or I loan it to them at no charge.