In my experience, even if an IP changes it is usually with a predictable range of numbers.
A provider can't simply change your IP address from, for example, 208.107.117.109 (Grand Forks, ND) to 208.207.117.109 (Burlington, MA). In this example, only the last six digits can change and still reflect a Grand Forks, ND IP address. Unless your member base is exclusive to one location, it is possible to block a range of IP addresses without blocking valued members.
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