OK...how's this example? your internet provider (dsl, cable...whatever you have) has a basic plan. you get the slowest speeds with that plan. if you want guaranteed faster speeds, you pay more for a premium plan. same with your phone. you can either pay for the tiered plans, or you can buy a 4g devices and not be throttled.
and if we're going to nit pick about examples.....the all you can eat buffet is PERFECT. if you've ever gone to one that has crab legs then you know that the pizza, chicken fingers, etc, etc stay stocked. guess which guests get throttled? crab leg eaters. they do single out particular guests and they are the guests that are consuming the most expensive food (or the customer that is costing the most by killin crab legs and making the experience less enjoyable to the other customers). they'll refill mashed potatoes as fast as it runs out......but the crab legs are empty half the time you are there. 
is the dude who can get all the Crab Legs.. But again.. your example doesn't quite apply.. When I signed on to Verizon for an unlimited plan, it never was inferred nor expressed that my speed would be slower. Its being force fed... My iPhone does not work on 4G so thats not an option.. And as far as the buffet, when the crabs are out, everyone waits, not just the fat guy...
Perhaps the best example is if you rented a car from Hertz and they say "You have unlimited milage"... You say GREAT!! You pack up the car and the kids and start your drive across the country only to find out that Hertz has regulated the speed of the car down and it won't go faster than 30 mph... Especially that they didn't tell you when you rented the car... Now you are on the highway with unlimited milage but can only drive 30 MPH and they are charging you by the day for the car... All of the other people who rented cars and didn't get the unlimited milage are hauling butt at 60 MPH..... No matter what, it will take you twice as long to get there... It flirts with false advertisement... But for sure its dishonest...