> If it followed the USPS model there would be a retention fee for the uploader and a transfer fee for the downloader, both based on size.
The problem here is that we're already only having this debate because people refuse to pay, even when what they're paying with is functionally intangible (i.e. their letting an ad play on their PC for 30 seconds.
So any model which relies on people physically paying real actual money* is doomed to fail to begin with because you're not solving the issue.