I'm no dealer, but I have heard dealers in the past say that they price their items high on ebay and at shows because getting high quality Pre-War inventory is quite hard.
Its not like people walk in with a stack full of Orange Borders every day. So when they get good stuff they price it high in hopes to make some good coin on it.
I don't condone the practice, but everyone should realize that inventory for pre-war dealers ain't that easy to come buy.
Every collector likes to get a deal....and I'm sure every dealer out there likes it when someone overpays.