I'm all about supporting my LBS, there are 3 of them close to my house that I love. I've bought things from each of them, equipment, etc, and my wife's bike got tuned up, new tires and a fly wheel installed.
But the majority of a lot of the other stuff (jersey's, tape, cage, trunk bag & rack) was all bought from nashbar or amazon. Sorry, I'm not paying $99 for a trunk bag at the LBS when I can get it from Amazon Prime 2-day free shipping for $65. That $35 I just saved just paid for my tail light - also from Amazon for $10 cheaper - which just paid for my handlebar tape from Nashbar, and so on.
I will definitely always go to my LBS for help, tune ups, parts, and things like tubes, or tools. But for a lot of the peripherals, sorry, we're a one income family and we need to save money wherever we can.
(It's no different that buying all my DVDs from Amazon, instead of from Best Buy.)