It is in the dive operators best interest to grow there business by creating a positive customer experience. Minimize the number of deaths associated with the activity, provide support appropriate to the customer’s needs/desire.
There are regular charter runs to some of the most dangerous wrecks in the world. People die on them all the time (the Andes Doria is a good example). They vet their customers carefully because they know very well that letting a guy wetsuit dive on the wreck with a couple of aluminum 80s and a cheapo computer going to result in a lawsuit, bad press, the loss of their license and a mess of criminal and civil prosecutions that will likely bankrupt them.
Yes heads in the water is important, but how you get them and build a sustainable business is actually important