Please do not confuse bandwidth with Net Neutrality. What you are discussing here is just bandwidth. We already have tiered pricing for bandwith (a dedicated T3 costs more than a DSL line) and that works fine. If someone wants to run Joost 24/7, they can pay a little more for the extra bandwidth.
Net Neutrality is about preventing ISPs and all the middle-man routers giving preferential treatment to certain network data based on nearly arbitrary rules that include business deals, what they like/don't like, and other BS. Net Neutrality must be upheld at all costs. If we lose Net Netrality, the data and services on the internet will be controlled, similarly to how data is controlled on cell phone networks. All you need to do is look at the $15/month fee to download 20 youtube videos on cingular to see how much that sucks.
Bandwidth != Net Neutrality. Please don't confuse people, there's too much at stake with Net Neutrality to add confusion to the mix.