[Terretta]

I'm not aware of any real CDNs dropping someone for "load getting too high". Also, for a real CDN, 100k+ clients isn't noticeable.

If you're talking about the "unlimited traffic" or "price too good to be true" commodity delivery resellers, their business models are sometimes built on overselling and like a cell provider, those will throttle or drop you.

That said, a "network of networks" is a great strategy beyond a certain level of traffic. Nine Systems built a great business on that principle for video streaming until purchased by Akamai. Balancing video over multiple CDNs is a service we offer as well.

Finally, if your CDN SLA doesn't hold the CDN liable for going down, you're doing it wrong.

[moe]

In video-streaming 100k+ clients equates to 25+ GBit/s. Yes, that is noticable, even for a "real CDN".