Unfortunately many feeds come and go. Some people put up the feeds before they get everything programmed and running smoothly, then they loose interest trying to deal with the problems, and drop the feed entirely.
I had a friend who put up a feed three different times, but knew he had computer and ISP issues and they went offline permanently a week or so later each time.
I had had a couple smaller feeds prior to my current feed so I knew how the software and my computer worked and already had my scanner programmed.
When the city police feed became available on 3/25/2012 I jumped on it, and it just runs itself ever since. (They are due to go digital soon however so I have a digital scanner standing by).
I have regular listeners from around the world. It is usually in the top three feeds, at night that is.