Are you talking about people matching speed at 45 in a 65 or are you complaining about people matching speed at 65 in a 65?
The former is understandable, but if it's the latter, why should I make room for you to break the law (go over 65)? Sure, it's your choice to speed, but I don't see where I should feel bad about doing the speed limit. When signs say "slower traffic keep right" they mean slower than the speed limit. Grandma Moses shouldn't be in the far left lane doing 50 in a 70. The left lane isn't where it's magically acceptable to speed.
People around here seem to think the speed limit is dependent upon the distance from the car in front of you. If you can't see anyone, the 65 is a 90. If you're about half a mile behind them, it's an 80. Quarter mile and it's a 70 until you're sure it's not a cop. Then it's back to 80 until you're 6 inches off their ass. At that point, you either change lanes without signaling (it'd require putting down the cell phone) or, if you can't pass, sit on their ass and flick your high beams on and off in their rear view mirror until they miss a turn and run off the road in a blind stupor.
I actually saw a woman driving with her elbow this morning. She had the cellphone in her right hand and her left hand was blocking the sun from her eyes. Her visor was up and it wasn't even that bright out.