Servus!
For me, the killer would be having to a) pay for shipping and handling, b) having to wait until the goods actually arrive, and c) having to deal with a non-existasnt Customer service should the goods be defective, not in stock, got lost, postman stole 'em, etc.
Why should your bucks go to keep a industry giant's pockets lined when you can have the warm'n'fuzzy feeling of keeping your local LBS alive.
I personally can't wait and go nutz when the stuff isn't in my hands.