They’re bummed out that they couldn’t get the tickets they wanted due to this unforeseen problem. But if you bought the tickets beforehand, now you have the opportunity to sell the tickets. You can bump up the price since the tickets are sold out. And the person who buys the tickets will be grateful. They weren’t able to buy them before but with their paycheck in the bank, they can now.
Regardless if you need to earn some fast cash or we're just talking about making money in the grand scheme of things, there's an important psychology that needs to be mentioned before getting into the strategies. If you study Freud's model of the mind, you'll discover the Psychic Apparatus. It's the three-part construct in your mind that controls all of your behavior.