So I guess the answer is 'no' - it's not really worth the effort, even when live video broadcast to tens of thousands of destinations is your principle business; possibly once it scales up to millions is where things start to look different, but at that volume you can invest in the infrastructure to avoid having to send it over the internet.
Here in Germany, Deutsche Telekom is happy to sell you access to IP-based high-definition broadcast television, in competition with traditional cable TV providers. They do have a couple of million users. In this context, IP multicast, which is in fact being used, makes a great deal of sense.
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