If you're paying for 100mbps, and the person you're talking to is paying for 100mpbs, and you're not consistently getting 100mbps between you, then at least one of you is getting ripped off. This reality where you can pay extra money to make sure the poors don't get in the way of your packets has never been the one we live in.
Of course, there are definitely people who are getting ripped off, but "fast lanes" are just an additional avenue by which to rip them off a little more; not a single provider who's currently failing to provide the speed they advertise is planning to suddenly spend money fixing that and offering a new tier on their suddenly-properly-provisioned internet, if only net neutrality would go away.
As Bill Burr said, I don't know all the ins and outs, but I know you're not trying to make less money.