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I suspect Youtubes main opex is bandwidth. So it all depends on how traffic costs develop over time in relation to advertising revenue. Could this be a motivator for Google Fiber? By cutting out the middlemen, they can lower running costs for their own services.

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I believe storage won't be a cheap thing either for this type of business. 300 hours of new video every minute[1] is a lot.

[1] https://www.youtube.com/yt/press/statistics.html

Definitely. They try to compress the videos as much as they can, load comments only if you scroll down etc.

I doubt lazy loaded comments have anything to do with bandwidth concerns - a page full takes less than a single frame of video. Most likely, it's to avoid internal IO, especially now that they're pulling comments from Google+ as well.

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