My problem is that you're currently not paying for bandwidth either, because ISPs generally don't promise you all of the advertized bandwidth all of the time. There have been times when my ISP has been unable to deliver the bandwidth that was advertized to me without throttling things like BitTorrent. I would be 100% for net neutrality if that problem actually got addressed. Most of the examples I've seen of companies throttling things are actually very high-bandwidth services - it's not just things that people are willing to pay more for or that compete with the ISP. Without that solved, then yes - I'd like to be able to pay more to get my work prioritized over entertainment or piracy.
If they throttle due to load, then they should simply throttle all load equally, or in accordance with consumer preferences (e.g. per-line prioritization of VoIP above torrents, but not, say, Comcast VoIP above Google Voice). When the network is full, every customer should get their fair fraction of the network to do with as they please.