The entire Internet, business and home, is oversold. There is no way the Internet could sustain the traffic if the millions of Internet connections were one day to all be used to 100% of rated capacity at the same time. The issue is how close to the end user is the bandwidth oversold? If you live in a neighborhood and there are 20 homes on a 100 megabit connection you're more likely to see an issue than if your cable company doesn't have a big enough pipe to the Internet to support the tens of thousands of users they have. The likelihood of tens of thousands of users all using a large portion of their bandwidth at the same time is far less.
I suspect Verizon FiOS throttles certain connection types. I'd noticed when running torrents (legal content only) the uploads were pretty slow regardless of the time of day. Verizon started advertising that uploads are now the same speed as downloads. Torrents now seem to be faster, like 10X faster. Coincidence? Maybe.
Here was an interesting listen I caught recently. Not necessarily about net neutrality but very pertinent...
http://www.podtrac.com/pts/redirect.mp3/traffic.libsyn.com/sciencefriday/scifri201411071.mp3
That parity issue is a competitive thing with comcast. Comcast will give you 50 megabits of potential downstream speed, and give you something like 1 or 2 megabits of upstream to go with it. People who like to trade media or upload large videos to youtube will find out quickly that even with a 15 minute video, comcast's upload is eye-bleedingly slow. Whatever limits them over coax doesn't seem to be the same issue for DSL or fiber or whatever you call those connection types.
I don't know what my "contract" speed with Comcast is, but my tested speed just this morning (speedtest.net, on my iPhone) was 33 Mbps down (I've been getting 33-39 regularly) and 12 Mbps up. The download speed is up about 4 Mbps from just a few months ago (I never saw more than 29 Mbps previously), and the upload speed has gone up from a max of about 5.7 Mbps. This with no price increase or action on my part. Our church has the business class service, and the upload speed is much closer to the download speed, though both are lower, I suspect because of location (only 3 or so customers down that leg of cable), and because there is probably less disparity between available bandwidth and sold bandwidth on that node.
Jason