Bandwidth is a huge issuse. When I worked at a previous provider we would FTP videos for our clients and sometimes it would take up to 4 days of downloading to get the huge files. And that was in the early days of dsl when videos were only 10 minutes. So when you have someone with ten hour long videos, that's a lot of time and bandwidth.

We had a choice here to either provide our clients with samples of our videos or make the videos available for download. We just couldn't do both. Most of our clients would rather be able to preview the videos before they buy then rather than buy them purely on faith.

Not to mention that the amount of time it would take to download five scenes you can get it by mail, and if you get it by mail you already have a backup.