So, where does this fit into net neutrality? ISPs can certainly sell QoS services to customers.

For some applications, this is important (e.g. gaming). For others, it could be a nice competitive advantage. But then with more & more of the ATM frames dedicated to QoS, that'll leave more contention (thusly, higher latency & drop) for the rest.

I'm just worried about who's going to use these facts for what ends.