As Adept points out, a static IP is preferable to a semi-static one or dynamically allocated one if you're going to run a server.
I believe my IP was blacklisted because I was online and particularly active when a DDoS attack was taking place, but you can also inherit a cursed IP!
Blackhole servers should never list dynamic IPs because these get swapped and passed around an ISP's users, but in my case, one over-zealous blackhole list did -- with almost disastrous consequences, until I finally mangaged to release my very stubborn IP!
Anyone using a dynamic IP runs a very small risk of being given a blackholed IP address, but it should only happen with a static address if you've been very naughty.
Hope this helps.