We are going to Mexico next week (flights not yet booked, but about to be).
Flights on Monday cost £735 total for our family of 4
On Wednesday the cost is £895 for our family of 4.
DW is organiser of a monthly lunch meetup with her friends. There are usually about six women, with their children, and each brings food. The next meet-up is not at our place, but at the house of one of the other people involved, and is scheduled for next Tuesday.
She says we can't go on Monday, saving £160, because she has given her word that the lunch meet would take place on Tuesday, and she says they would probably cancel it if she doesn't come (even though it's at one of her friend's house, who quite frequently has a lunch with just one other person).
I think she is being unreasonable, because there is frequently one of the 6 that cannot make it, and there's not really a significant difference between 5 cooking for 5 and 6 cooking for 6.
It's not that we can't afford the extra £160, it just seems wrong to 'waste' it.