What’s the biggest "hidden cost" you've ever ignored in a job offer?

e've all been there: the gross salary looks amazing, but then you realize the commute is soul-crushing or the "extra hours" make your hourly rate tank.

I'm building a tool to help people see through the headline numbers, but I’m curious — what was that one factor you overlooked that made a "great" job offer actually terrible? Was it the commute, the missing benefits, or something else?