Only problem I see would be the fluidity of IP addresses. Most people have dynamic IPs. I unplug my modem for 5 minutes, I get a new one assigned to me. Even ignoring that, a really determined person could do a bunch of things: get a new ISP, use a phone tether, connect at a public place, hide behind 7 proxies, etc.
Though I would totally get behind an effort that would permanently ban the types of offenders you list.
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