difference is mainly in gouging you...
concept applies to the theory, before mass lcd adoption, that if you had the money you'd overpay for everything.
Similar can be seen in tv mounts, where it should only be $20-50...they set the price at $300 for a tv mount.
this day and age the high priced stuff is going away, but slowly
you should be able to buy an hdmi cable for 10-20 and see no discernible difference