In my opinion the idea is a good one, although I think I prefer the idea of a group booking in one of the existing campsites, rather than being off-circuit. Being able to watch the action, whilst supping beer and then a (relatively) brief walk to fall into the tent does seem to be a bonus.
Rather than full hospitality I'd like to see an ability yo buy fresh bread, croissants, ice on site at an affordable price (accepting the need for some mark-up), maybe even cold beer and wine. Full hospitality sounds like making meal times etc too regimented, and presumably adds to the cost. Maybe paying a local to do the supermarket run ould be more effective?