I learn a lot more here and on forums for local divers than I do at my LDS. Any piece of gear I am curious about, I can learn about here. Any dive site I can learn about by talking to other divers.
I use local shops for tank rentals, emergency last-minute purchases, or purchases where there is little or no price premium. Choosing to pay them, say, $60 for something that I can get at LP for $20 is nothing more than charity. (Something where the warranty is critical, like a reg, that I'll concede you may want to buy locally. But I won't look down on anyone who goes to LP. I doubt they are picking out the O-rings and substituting cheaper ones.)
If I ask the LDS to order something for me, it also takes LONGER than getting it online. I ordered a Trident rubber belt from my LDS. It took them 30 minutes to flip through their various books, add it to their inventory system, and charge me for it. That was over 2 weeks ago, and they tell me it isn't even on the way to their store yet. I certainly don't feel like I am paying for premium service.
Maybe if any of the local shops had pools so I could try stuff out, they'd be worth the price premium.
Just my $0.02.