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Although it obviously isnt this simple, you could make a formula.
3 tiers of users:
1 - Joe Bloggs, found the site was looking for a specific video. Signed up downloaded, and hasn't use his password since.
2 - Timmy Bloggs, found the site enjoyed 20-30 videos.
3 - Asshole McGee, signed up downloaded everything on the site and fucked off.
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Assuming 10% of your users are tier 1.
70% are tier 2
20% tier 3
[50 x (1% of 600) x (10% of 1500) = tier 1 b/w]
[50 x (10% of 600) x (70% of 1500) = tier 2 b/w]
etc etc
However this is an EXTREMLY rough guideline, every site varies obviously, but it could give you a basic building block to make your assumptions on. I'd say assuming you had 30gb of content and every member downloaded everything you'd need a 100mbit, but a 10-20mbit server would probably cover that members area.
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