The ski trip one does seem bogus. The person obviously wanted to go on both trips since they bought tickets for both. Unless something has changed and they no l

The ski trip one does seem bogus. The person obviously wanted to go on both trips since they bought tickets for both. Unless something has changed and they no longer want to go on the $100 trip in the future, then it makes sense to go on that one now to reduce future costs (spend $100 in future vs spend $50 on other trip in future). Whether they enjoy the $50 trip more than the $100 one, or think they may do, is irrelevant if they still want to experience both (as one can assume by their having bought tickets for both).