Yah, running services is part of why I like having a static IP.
But the most important thing to me is, I never
negotiate with some server for an IP address, and never have to
worry about there not being an available address at any given time,
the way I saw it happen on occasion with my housemate's dynamic IP.
That's pretty important to me.
That my buds who run their own household ISP can tweak their
DNS settings so that I can be east.elfhill.com, and that I can
host multiplayer D2 games, is icing on the cake... ;)