Answer: FEES

Fees are additional costs or charges that are added to the original price of a product or service. It can include various expenses, such as processing fees, service fees, or convenience fees. In the context of buying concert tickets, fees refer to the additional charges that are often applied on top of the ticket price, which can sometimes be considered unpleasant surprises for buyers.

Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Unpleasant surprises when buying concert tickets. Explanations are generated by AI and may be inaccurate.