For many years the world’s richest person, Bill Gates is nevertheless known for being a humble sort, sporting a modest US$50 Casio most of the time. When it comes to luxury watches, he has been spotted wearing a Tag Heuer Professional 2000 at a conference in the Philippines – but not for long. Watch Ranker reports that Gates encouraged the conference audience to guess the watch’s price, and when one participant came closest with his guess of US$600 (it’s actually worth US$1,400), the Microsoft founder gifted it to him.