Amazing! I could not realize this 'off-line' business model aspect of the site!
But must work as all other online-to-offline modeled businesses. You can contact Springwise.com maybe they'll put in their feed, they like these on/off combinations.
The 'off-line' model is actually quite common in the wedding world. I know a person running a wedding website hosting (planning, photos, invitations, etc) site where the couple can get everything on a CD once the wedding is over for a small charge.
Useful to keep these additional models in mind when thinking of a new business idea
But must work as all other online-to-offline modeled businesses. You can contact Springwise.com maybe they'll put in their feed, they like these on/off combinations.