Well I think the commercial aspect will probably be the ticket price for the trip. As far as for-sale accommodations during the trip, I expect them to be analog

Well I think the commercial aspect will probably be the ticket price for the trip. As far as for-sale accommodations during the trip, I expect them to be analogous to those you get during airplane flights: mostly refreshments. Since looking at the earth will probably be one of the main attractions of such an elevator trip, I bet most people will plan to bring binoculars, so I don't foresee a significant market for that particular item.