Not winning -- earning. You can ( if your rank is high enough, or if there's demand for it) join a active signature campaign here, -> https://bitcointalk.org/index.php?board=52.0 which pays you for making constructive posts which basically advertises their brand.

How much you can earn is very depending on the quality of your posts and which rank you are. ( Higher ranks have better looking signatures, and usually there's also a correlation with your post quality.)