Why should it matter to QoS how many tickets are sold? That's not supposed to sound cheeky, it's a genuine question. I have no idea how the business works but what I thought happened with regards to these types of concert; specifically Status Quo and Palmerston is this:-
Status Quo hire Palmerston. They pay us £££ for the rental of our facilities. Status Quo's management are responsible for the advertising. The only thing I thought QoS FC would have to provide is a suitable venue and security/safety. The amount of tickets sold for the gig shouldn't affect the amount of money QoS receive as the hiring of Palmerston should be a set price. If the band don't sell as many tickets as they expect then that's tough shit for them, but QoS still get their agreed fee. As I say, I don't have a clue about the way it works, but I'd be pretty shocked and disappointed if it's QoS' responsibility to do ALL the running with regards to selling tickets.