How Many Succesful Servers Have You Had?

A couple years ago I opened a PERP server with a heavily modified version and ran that for about a year with 10-15 average players. It was a hell of a lot of fun, running servers is really enjoyable to me for some reason. I ran a fairly popular MC server for a few years too. And I've hosted a few SWRP servers for friends of mine that had 30+ players on. Ended up outgrowing my hardware :/