having read both sides of the argument i just think a little courtesy is needed.
sometimes i'm the driver cruising at 70 & don't take kindly to people storming up behind you & flashing their lights!
other times i don't mind stretching my legs a bit. but as i'm the one breaking the speed limits it's up to me to second guess what the other traffic is about to do! i don't mind letting people out into the fast lane even when i'm on a speed mission!
i always try to show a bit of courtesy in the vain hope people might start to return the favour one day!