Unless you can prove that it's probably best to keep quiet. You're probably right, but the only people who can answer it are Google's accountants and they're not talking. Of couse you could believe theregister and it's ilk but then you're as bad as tinomen. Bandwidth costs will be astronomical but youtube should be able to find an advertising model that doesn't force adverts on people inside the videos. Or go subscription. Or PAYG. Either way, ads in videos will stop me using it but I'd be happy to be charged a few pence for each video I watch.