[einfach]

I was going to ask the same thing. The Accounts & Billing FAQ does seem to concur that you pay for P2P delivery:

> A: For the pay-per-Gigabyte tiers, Peer5 charges you at the end of the month based on the agreed upon price and actual amount of data delivered through our P2P CDN during the period. For the Pro tier, Peer5 bills the flat rate at the beginning of the month. For the free, Starter tier, there is no billing, but we do cap your P2P delivery at 1 TB per month.

[shacharz]

The point is that there's no double billing, http traffic is being billed by your existing CDN. P2P traffic is billed by us.