Come to think of it i it was Bruce Springsteen i believe. Alone with his guitar for two hours
But I don't think it's going to cost her all that much. I think she's done with the extravaganza. And she probably was serious about reinventing touring so it could be an art installation/comedy (God I hope not)/a song here and there to fill the gaps.. I saw her on RH, her energy was way lower than on her previous tours so i think she's done with all the jumping around and big production shows. Which can be a good thing, I am waiting to be surprised.
PS even if it is once a week with huge production costs i have no doubt that her ticket prices are going to be totally absurd, especially if she does small venues. And that there will be more than enough people willing to pay that price