One thing for sure is the myth that is propagated in the industry by PADI implying that the PADI Card will be more recognized than other agencies as if somebody flies to someplace in the world would be denied diving if he had a certification card issued from an agency that is not PADI. As I have said in prior post most dive operators care more about the color of your money than anything else.
Along with this the only time I ever had trouble was I wantted to do a night dive with a few buddies and the guy told me I need a PADI night diver card. I then had to explain to him how NAUI works and that PADI is not the only agency out there. He pushed the matter a little bit further but then soon backed off after I said a few words I will not repeat and then told him I will go pay someone else who has a brain to let me do a night dive. I mean NAUI does not even have a "night diver card"...
You are right money is the end all. If a place wont let me dive because I dont meet PADI requirments and I am NAUI trained then I really dont need to dive there. This problem is very rare to the fact that I live in Florida.
Note: this is not a bash on PADI this was a bash on the douch at the counter.