I think they use Amazon S3, so their cost is 5 cents/GB of storage + bandwidth costs. I would assume more referrals = more conversions and any conversion should be very profitable.
I wonder if they will reach a tipping point where it will be cheaper for them to have their own distributed hosting setup. I think Ubuntu One is doing it right now (I haven't used it yet) http://en.wikipedia.org/wiki/Ubuntu_One
Comments
I think they use Amazon S3, so their cost is 5 cents/GB of storage + bandwidth costs. I would assume more referrals = more conversions and any conversion should be very profitable.
I wonder if they will reach a tipping point where it will be cheaper for them to have their own distributed hosting setup. I think Ubuntu One is doing it right now (I haven't used it yet) http://en.wikipedia.org/wiki/Ubuntu_One
Amazon is amongst the most expensive afaik