[aen1]

Wonderful point. There's a Doctorow article I read somewhere that essentially put forth the following logic for digital distribution:

There will be a group of people who would not acquire the content unless it was digital. They may buy or pirate it. This is the group of interest. If more people who weren't going to get the content (b/c of lack of exposure, lack of interest, etc.) pay for it than don't pay for it, the digital venture is worthwhile (This ignores that some people who would have bought it non-digitally may pirate it, though that group is small; if you wish to support to movie by paying for it, you'll most likely do it regardless of medium)

For example: 100 people would have bought the movie if it was only physical.

100 other people will have never heard of the movie unless it is released digitally. Of these 100, 75 people buy the movie, 25 pirate it.

By listing it digitally, the publisher gets 175 people's worth of profit, and 25 people's worth of "loss". Therefore, it is worth listing digitally.