They care very much. Before PAADI gives out their prestigious 5-Star rating they inspect the dive shop very carefully to ensure that they can trust that any check they recieve will be cashed without incident. Their team of trained inspectors know how to interview, inspect, and appraise the ability of any shop to not just live up to the standard that PADI prides itself on but to, more importantly, pay their regular dues. Of course, any issues with the former can easily be rectified by assurances that the latter will, in fact, take place.
Plus, it depends on if you are PADI yourself. If they try to run over another PADI diver they will take away the 5-star rating in a heartbeat - that diver may, in fact, give checks to PADI in the future for further training. However, if they try to run over NAUI divers, well, that is how a dive shop gets the 5-Star PADI rating.
Now you know.
PS. Don't get mad. I am PADI certified. I know nothing about it. I just wanted to write something funny. Please direct all complaints to:
PADI Americas
30151 Tomas Street
Rancho Santa Margarita, CA 92688-2125
USA
If you do, you can earn your Complaining Diver Certification. Don't forget to enclose your check.