For one thing, I like it when the guys behind the counter are as knowledgeable as I am... I mean, it'd be hard to hold someone to my standards because of all the information I glean off the internet, but after all... it IS their profession.

I hate it when I mention something that's the latest rage all over the internet (e.g., Slick Tricks) and they've never heard of them. I ESPECIALLY hate when a shop runs down a brand simply because they don't carry it or have access to it, regardless of the manufacturer.