Another data point: I have a gold IMO medal (only 4 people in my country ever had it), and in the following 20 years I never had a phone call or an e-mail saying: "We have this project where we need math talents, and I saw your name online, so if you are interested I would like to tell you more details."

No one cares. Seems to me the only predictor companies use is: "Did you do the same kind of work at some previous company? How many years?" and then the greater number wins. (Which effectively means that one is paid for their age and their ability to pick the right technology when they finish university and stick with it. Kinda depressing.)

EDIT: As a sidenote, I did not use my math skills significantly since university, so in my case the IMO medal is probably not so good predictor now.