The finances work the other way around: you can often pay your transit/upstream providers an additional fee for their DDOS protection/filtering service, where you can signal (via BGP or otherwise) that there's traffic you don't want to receive. BGP Flowspec (or similar) is one of the technologies used here.
DWDM tech improvements have outpaced nearly every other form of technology growth, so the same single pair of fiber that used to carry 10 Mbps can now carry 20 Tbps, which is a 2,000,000x multiplier. The same somewhat-fixed supply of fiber can go a very long way today, so the price pressure for access is less than you might expect.
Depending on the streaming protocol (eg WARP), you can specify that the tracks (audio vs video) need to be time-aligned, so each group (chunk of video or audio) starts at the same time and lasts the same length. I think this means you'll get resync'd at the start of the next group.
IT and Networking
Currently @ Valve
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