I'm late to this thread, so here's my reason for supporting my LBS: My rear wheel developed issues. The rim was failing at the spoke connection points. The LBS hounded the manufacturer into replacing both wheels with a new, and better set for no cost to me. Second incident: I crashed in April and headset was a little loose as a result. I took the bike in and they fixed it free, under a recall warranty I didn't know about.

Service. Get that from the interwebs. BTW, my LBS is Riverside Cycles, located in Newburyport, MA.