1. If, as you claim, information is what is being sold, then the transaction is dependent on the information being true when the person gets there.
2. If a salesperson needs to physically occupy the location until someone gets there so that the information remains true and the transaction goes through, what is being sold/auctioned/sold/exchanged for money is access to the physical location, not the information for it.
3. You don't have a right to sell access to public property.
In order for #1 to be true, #2 needs to be true itself and that makes the entire thing illegal.
Do you know how businesses work at all?