Well, I have a similar story but I chose to be honest about it. My favorite LFS manager had a falling out with the owner, a silent partner. So my LFS guy quit.. moved on to open his own store. Well, the owner now had a store full of fish/corals and no clue how to run it because he was a construction worker that just bankrolled the store. So he throws his son in charge of the store.. a bricklayer by trade.
First day I walk in there when the big change happened. There are no prices on anything and the store was a mess. There were a couple things I wanted though so I asked about prices.. the guy didn't have a clue so he just tells me to make him an offer. I informed him that the "wholesale" price sheet was behind the counter because I didn't feel like being a thief. (years of visiting this LFS you get to know a few things). He thanked me, and sold me every item I wanted at his cost just because I was honest and helped him out on his first day on the job. Some of the items he said I could have gotten a lot less than wholesale if I just gave him a price.. but in the end, I saved 90% off the cost of everything. That is what this LFS marked things up.. Now I won't visit that store again because it has been run right into the ground due to lack of knowledge/experience .. just happened to be one of those right place at right time things.