Nobody on the planet can run low margins with high service. Not Walmart, not McDonalds, Not FedEx. It just doesn't work like that.
I guess that depends on how you are defining "service". If we define it by price protection and return processing, I get far better "service" at the big box retailers than at mom n pop places. I also tend to get faster repairs. And business doesn't rely on one employee and everything grind to a halt when he is out. My last tank VIP took 3 weeks because "the VIP guy" was away on a trip.
If we define it as product knowledge and the ability to educate the consumer, then yeah you have a point. But those of us that are literate and can do their own product research and educate ourselves don't feel the need to pay more so those that cannot will have a product consultant at their disposal.