[derstander]

> but I can't get to why it should become freely shareable.

A side effect of this would be to encourage the creator or company to continue making it available.

> Secondly, that puts an unfair burden on creators. If I do a run of of my book, and it sells out, I don't think it becomes open season on duplicating it digitally, and I shouldn't have to always carry excess inventory just in case it's a hit.

That’s why I explicitly included a short time period to account for such hiccups. And, for example, if you’re talking about books then print on demand is certainly a way to satisfy the for sale criteria.