Hi, I’d like a ticket for the new transformers movie, but id there are any explosions I want my money back.

Sure that’s just negotiation, but in that case I’d argue just as well that the costumer is being unresonable because he has expectations of the experience that simply don’t align with what is being offered. And if the establishment decides not to take your business because of the unusual request, which is wierdly dependent on how things play out I would not hold it against them.

As for not wanting clues, you can just tell them not to provide them and they wont. No need for the weird conditional payment option. You’re taking away a timeslot no matter what and costing them money, if you want to do that you need to pay, wanting special conditions on that payment is “rather harsh”.