Network security is a key issue for many people. This falls under that umbrella.
I'll keep my snide opinions about IIS to myself and just point out that (as the OP noted) this can be used to block IP ranges as well as individual addresses, which counters the whole dynamic IP thing.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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