I just purchased it. That was simple as possible (enter e-mail in box, redirected to PayPal, redirected to page with stream and download buttons). There's a streaming limit (3 views) and download limit (5 downloads).

The download is hosted on Amazon S3 where I'm barely getting 500k/s. The stream and download limits would then limit his delivery costs to ~$1.50 per customer with S3's bandwidth pricing. PayPal is taking out $0.41. He could be getting as little as $3 of each $5 for the special.