From a West Coast (of the US) perspective: The moment a non-profit (or most any other) dive club gets big enough... or gathers a good bit of momentum... it will encounter resistance from many/most local dive shops. Those same dive shops will either attempt to put the club in their back pockets (control and $$$-wise) or shun/marginalize/discredit the club and it's members.
And if said club runs it's own trips, then it can look forward to even more hard feelings on the part of those shops. Nevermind that trips have never been the sole purview of shops... or that large clubs provide a much-needed service, that of getting and keeping divers in the sport (divers who then go to shops to purchase their gear & training)... dive stores take a dim view of those they see intruding into their "territory". I can only imagine if that club tried to sell air fills, training, or gear (in a no-profit manner). Armageddon!
The enmity, misinformation-spreading, and disregard of some dive shops needn't be a fatal roadblock for a club's health, but it can certainly be a frustrating, exasperating feeling to know there are shops and employees working actively against you for no other reason than your having the temerity to bring divers together, ask for better prices, go on trips together, and have a bit of fun.