Why we need net neutrality

People buy a Lexus for a lot of reasons, just like people use Google or Bing for a lot of reasons. What if Lexus paid a company that makes stoplights to build in mechanism that would make their lights turn green faster if there was a Lexus waiting in line? Would that be a problem? What if they also added a feature that would make the light turn slower if there was a Honda waiting in line? This is achievable with current technology. It hasn't happened yet, and it probably won't, but it's not outside the realm of possibility.

Conversely, this type of bandwidth throttling/enhancement has already happened on the internet and must be stopped to ensure a free and open marketplace of ideas.