The simple answer is that Bombardier does. Mi.Net is a hobby and not a commercial venture. Some funding comes from the limited advertising on the site and some comes from member donations. The site is image intensive and as such uses up web space and bandwidth very quickly, so all donations are very welcome. The money received will be used to pay for the bandwidth and web space and also future improvements.
If you would like to donate money, however small an amount. you can click the paypal button on the front page of the site.