Time spent preparing (four years, preparing for three different court cases in the three different circuits)
high paying job offers that fell through because of the uncertainty involved
Living under constant stress for four years straight
I wouldn't even dare to put a number on this
As I usually say re the US "How is THIS not an issue in the election?"
If I was reasonably sure I had the law on my side I'd dare go to court against an entity of any size, relying on the convention that the loser pays, and the rulings are nearly always in favor of an employee.
I don't think it's any more fair than the current US system.
I'd most likely face a less than 1% risk of paying less than $100k, even if the other party is a global mega corp. Also, the tech workers union I'm in can step in to back legal fees.