Bug reporters are less familiar with how to use bug statuses than other Launchpad users and may not know that they should set the status of a bug they have responded to back to New. Additionally, when adding a comment via the web interface, which one would do at the bottom of the bug report, or replying to a bug via e-mail it isn't easy or intuitive to change a bug's status back to New. Subsequently, I believe that bug reports that are "Incomplete w/ response" should not be eligible for expiration.
Bug reporters are less familiar with how to use bug statuses than other Launchpad users and may not know that they should set the status of a bug they have responded to back to New. Additionally, when adding a comment via the web interface, which one would do at the bottom of the bug report, or replying to a bug via e-mail it isn't easy or intuitive to change a bug's status back to New. Subsequently, I believe that bug reports that are "Incomplete w/ response" should not be eligible for expiration.