My business model has worked. It can work for anyone. By lowering prices we have brought more people into the sport - many who otherwise could not have afforded it in our area. Everyone loves a bargain... and top notch training at fair prices and big savings on equipment is a winning combination for any scuba retailer in the country.
I really wonder about the "it can work for anyone" statement. My guess is that you strive to be the "value" dive center in your area and it's working for you... likely because you are one of the few in your area pursuing that strategy... what happens if EVERY dive center in your region goes the same route? Are you all going to see a flood of new divers wanting suddenly to scuba dive because it's a bargain compared to what it was?
Lower price doesn't always mean more customers. Airfares to Hawaii are 50-60% lower than they were last August, hotel rates are down 20% or more... what a bargain, but where are the people?
My guess if every dive company in your region was to go to your business model, many divers would save money, but the sport wouldn't necessarily develop revenues enough to offset the lower pricing structure, and few or none would be prospering.