Always have your favorite nuts and seed freshly roasted.
A roaster that contains your favorite nuts or seeds, and at the push of a button roasts one portion quickly.
Might help self-select different target audiences.
Price relevant products based on their freshness, with (most of the time) the freshest being the most expensive.
Books, even ebooks are fixed things. What you get is a finite product of that edition. Most likely by the time you read it, at least some things have changed.
Create a format that allows the author to push new editions to current buyers of previous versions. The reader will get an alert that he has now a new edition; a brief description of the changes and additions; and the possibility to read any of the editions published, and at any point also see the current text’s other edition versions.