I think (I could be wrong), that relatively few people would value the recordings from every show on a tour. But, many more people would value somewhat exclusive access to the recording for a show they attended in person.
As someone else mentioned above, with jam bands each performance is unique, and people definitely value getting access to every show. For bands repeating the same set as identically as possible on a tour, not sure how much it matters which performance you listen to. Although some people might be into it, for the "I was there" novelty factor.
