Is that project lifetime total users, or daily active users ? Each daily active user is worth ca 1 USD/month ... Just put up a banner like "your ad here ? Contact your@email.com" And write in big letters on the front page how many users are using the program right now. Then call some news papers with a cool story about how you made a program that is used by 100k people, and talk about the DIY movement or whatever.
local news papers love local succes stories. even a bad story can be published if you do most of the work yorself basically writing the story for them and supplying photos. there are people making a living selling stories and photos to news papers.
