The DMs do not get paid at Bonne Terre. Actually, the DMs are required to buy all their gear through West End. They cannot dive with any gear purchased elsewhere, even if it is the same gear West End sells. The prices at West End are full retail, even for shop employees. It is also expected that they leave all their gear at the mine, and those that take it home are often asked for a reason why. Any outside diving is discouraged.
I'm really surprised they manage to get anyone to work or dive there, but I guess there marketing is effective enough.
There is another mine very close by called Mine LaMotte, although it is much smaller, and has an open pit area that leads to pretty crappy vis. There is also a much much larger system of mines formerly owned by the St Joe's mining company, which also owned Bonne Terre. It was shut down in the 70's when they had mined all the lead out. It is also underwater, and the visibility is reportedly just as good, but the veins were much deeper, and the majority of the 300+ miles of passageway are 4-500' below ground level, with the water table being about 80' below ground level. The old mill is owned by the MO dept of Conservation, and operates as a museum now. The primary headframe has been sealed off, so there is no one permitted into the mine. I'm not sure what the status of the other shafts is.
Tom