There's a fine line between a hobby and an obsession.
So long as it's a hobby you strive to acquire pieces at a price under the catalog prince.
After that once you turn professional you don't mind catalog prices and there's a drive to acquire choice pieces. This is where the likes of Niel and Rasmussen come in.
Like Pete mentions they are doing it for a living. If you need quality then be prepared to shell out top $