How do people make money on websites that dont sell any product? -

I ve always wondered that, like craigslist, or gossip sites, or where people just talk, how do the people who start the sight get rich?

I don t think all sites make money, (I m think craigslist). But blog sites like you mention probably make money by through advertising. If you can generate enough traffic to your site advertisers will pay a lot of money to advertise on these sites.

They can rent advertising space because they get a lot of traffic. Craigslist does charge $25 per ad in the big cities.